WO2019225393A1 - In-vehicle power supply device - Google Patents

In-vehicle power supply device Download PDF

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Publication number
WO2019225393A1
WO2019225393A1 PCT/JP2019/019066 JP2019019066W WO2019225393A1 WO 2019225393 A1 WO2019225393 A1 WO 2019225393A1 JP 2019019066 W JP2019019066 W JP 2019019066W WO 2019225393 A1 WO2019225393 A1 WO 2019225393A1
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WO
WIPO (PCT)
Prior art keywords
conductive path
voltage
switching element
voltage conversion
unit
Prior art date
Application number
PCT/JP2019/019066
Other languages
French (fr)
Japanese (ja)
Inventor
一輝 増田
Original Assignee
株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社オートネットワーク技術研究所, 住友電装株式会社, 住友電気工業株式会社 filed Critical 株式会社オートネットワーク技術研究所
Priority to US17/058,216 priority Critical patent/US11180097B2/en
Priority to DE112019002643.7T priority patent/DE112019002643T5/en
Priority to CN201980030266.1A priority patent/CN112074429B/en
Publication of WO2019225393A1 publication Critical patent/WO2019225393A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/20—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having different nominal voltages
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present invention relates to an in-vehicle power supply device.
  • the storage battery and a load connected to the storage battery may be separated and stand by when the IG is off. In this standby state, the charge stored in the capacity component in the load is discharged, and the difference between the terminal voltage of the storage battery and the voltage of the load increases. If the storage battery and the load are connected in a state where the difference between the terminal voltage of the storage battery and the voltage of the load is large, a large inrush current is generated between the storage battery and the load.
  • Patent Document 1 As a technique for solving this type of problem, a technique as described in Patent Document 1 has been proposed.
  • a large inrush current is generated between the storage battery and the load by precharging the capacity component in the load using a step-up DCDC converter before connecting the storage battery and the load. That is holding down.
  • the switching element which is a main element for performing the voltage conversion operation must be driven by the driver, and for that purpose, it is necessary to supply power to the driver.
  • a configuration in which a plurality of switching elements are used in parallel or a converter is connected in parallel to be multiphased is used. Due to the increase in the number of parallel connections, etc., the current (drive current) output to the switching element via the driver tends to increase.
  • the present invention has been made to solve at least one of the above-described problems, and even when the power supply voltage is lowered, a situation occurs in which the control unit that receives power supply from the power supply cannot control the precharge operation.
  • An object of the present invention is to realize an in-vehicle power supply device that can suppress this.
  • the in-vehicle power supply device configured to be supplied through the first conductive path
  • the power from the second power supply unit is configured to be supplied through the second conductive path
  • the capacitance component is the first.
  • a switch unit that is electrically connected to a conductive path and switches between an on state that allows energization from the first power source unit to the capacitive component side and an off state that blocks the current between the first power source unit and the capacitive component.
  • the voltage applied to the first conductive path is stepped down and applied to the second conductive path, or the voltage applied to the second conductive path is boosted and the first conductive path is provided.
  • An in-vehicle power supply device applied to a conductive path, A drive switching element and a first inductor that perform an on / off operation in response to a first control signal that is alternately switched between an on signal and an off signal are provided, and the first conductive path is turned on and off by the drive switching element.
  • a first voltage conversion unit that performs a first voltage conversion operation of stepping down a voltage applied to the second conductive path and applying it to the second conductive path;
  • a backflow preventing switching element that is provided in the second conductive path and blocks the flow of current to the first voltage conversion unit in the second conductive path during an off operation;
  • a second inductor provided between the first voltage conversion unit and the backflow prevention switching element in the second conductive path, and provided in series with the backflow prevention switching element;
  • a semiconductor element comprising a diode or a switching element having one end electrically connected between the second inductor and the backflow preventing switching element in the second conductive path and the other end electrically connected to a reference conductive path
  • a control unit for outputting the first control signal to at least the driving switching element;
  • the in-vehicle power supply device can cause the second voltage conversion unit to perform the second voltage conversion operation in response to the establishment of the predetermined precharge condition, so that at least the second voltage conversion is performed in this way. If the switch unit is switched from the off state to the on state after the operation is performed, the switch unit is switched from the off state to the on state in a state where the charging of the capacitance component has progressed to some extent. Immediately after that, an inrush current flowing into the capacitive component from the first power supply unit can be suppressed. In addition, when the control unit causes the second voltage conversion unit to perform the second voltage conversion operation in response to establishment of a predetermined precharge condition, one of the plurality of semiconductor switching elements constituting the backflow prevention switching element.
  • the second control signal is applied only to the element of the part, “the power necessary for the control part to drive the switching element for preventing the backflow accompanying the second voltage conversion operation” can be suppressed. Therefore, even when the voltage of the power source that supplies power to the control unit decreases, it is difficult for the control unit to perform the control of the precharge operation (control of the second voltage conversion operation).
  • FIG. 1 is a block diagram schematically illustrating a configuration of an in-vehicle power supply system including an in-vehicle power supply device according to a first embodiment. It is the block diagram which illustrated concretely the composition of the voltage converter contained in the in-vehicle power supply device. It is the flowchart which illustrated the flow of the pre-charge performed by the control part contained in the vehicle-mounted power supply device.
  • the in-vehicle power supply device of the present invention may include a plurality of third conductive paths that serve as power supply paths from the second conductive paths to the control unit.
  • the plurality of third conductive paths are connected in parallel between the second conductive path and the control unit, and the voltage applied to the conductive path on the second conductive path side is boosted to any of the third conductive paths.
  • a voltage generation unit that applies an output voltage to the conductive path on the control unit side may be provided. According to this configuration, even when the voltage applied to the second conductive path is small, the voltage generation unit boosts the voltage applied to the conductive path on the second conductive path side to increase the voltage on the control unit side. An output voltage can be applied. Therefore, even when the voltage applied to the second conductive path is small, it is easy to ensure the drive voltage necessary for the operation of the control unit.
  • the control unit applies the second control signal only to one semiconductor switching element among the plurality of semiconductor switching elements constituting the backflow prevention switching element in response to establishment of a predetermined precharge condition, and the second voltage conversion unit
  • the second voltage conversion operation may be performed. According to this configuration, since the number of driving semiconductor switching elements can be minimized when performing the second voltage conversion operation, the power consumed during the second voltage conversion operation can be further reduced. Can do.
  • the semiconductor element unit may be a switching element.
  • the switching element when the switching element is turned on, when a current smaller than the critical current of the second inductor or the first inductor flows, the reverse current generated in the second inductor or the first inductor ( Hereinafter, the reverse current) can be passed through the reference conductive path without being stored in the switching element.
  • the output width (duty) of the backflow prevention switching element is the reverse current. Can prevent unintentional changes.
  • control unit turns on the driving switching element during a period in which the second voltage conversion unit performs the second voltage conversion operation. In this way, the voltage drop that occurs in the drive switching element during the second voltage conversion operation can be further reduced.
  • an FET is used as the driving switching element, and the FET is turned off during the second voltage conversion operation, and the current flows from the second conductive path side to the first conductive path side using only the FET body diode as the energization path.
  • a method is also conceivable, there is a concern about loss in the body diode.
  • the driving switching element is turned on during the period in which the second voltage conversion unit performs the second voltage conversion operation, this loss can be reliably reduced.
  • the vehicle-mounted power supply device 1 (hereinafter also referred to as the power supply device 1) according to the first embodiment is a part of the vehicle-mounted power supply system 100 (hereinafter also referred to as the power supply system 100) illustrated in FIG.
  • the power supply system 100 includes a first power supply unit 90, a second power supply unit 92, a first load 94, a second load 96, the power supply device 1, and the like.
  • the power supply system 100 can supply power to the first load 94 using the first power supply unit 90 as a power supply source, and the second power supply unit 92 is added to the capacity component of the first load 94 discharged when the ignition switch is turned off.
  • the system is configured as a power supply source that can be charged (precharged) via the power supply device 1.
  • the first power supply unit 90 is a portion that can supply power to the first load 94 or the second load 96, and is configured as a known vehicle-mounted battery such as a lithium ion battery.
  • the first power supply unit 90 has a high potential side terminal electrically connected to the first conductive path 10 and a low potential side terminal electrically connected to a reference conductive path (ground portion) (not shown).
  • a predetermined output voltage is applied to the first conductive path 10.
  • the first power supply unit 90 is electrically connected to the first load 94 and the power supply device 1 through the first conductive path 10 when the switch unit 98 provided in the first conductive path 10 is switched from the off state to the on state. Connected.
  • the second power supply unit 92 is a part that can supply power to the first load 94 or the second load 96, and is configured as a known vehicle-mounted battery such as a lead battery.
  • the second power supply unit 92 has a high potential side terminal electrically connected to the second conductive path 12 and a low potential side terminal electrically connected to a ground portion (not shown). A predetermined output voltage is applied to 12.
  • the second power supply unit 92 is electrically connected to the second load 96 and the power supply device 1 through the second conductive path 12.
  • the first load 94 includes a capacitive component, and this capacitive component corresponds to an example of the capacitive component of the present invention.
  • the first load 94 is electrically connected to the first conductive path 10 and is connected to the power supply device 1 via the first conductive path 10.
  • the capacitance component may be a capacitor or the like, or may be another capacitance component.
  • the second load 96 includes a capacitive component.
  • the second load 96 is electrically connected to the second conductive path 12 and is connected to the power supply device 1 via the second conductive path 12.
  • the power supply device 1 can step down the voltage applied to the first conductive path 10 and apply it to the second conductive path 12, and step up or step down the voltage applied to the second conductive path 12.
  • 10 is configured as a device that can be applied.
  • the power supply device 1 includes a first voltage detection unit 80, a first current detection unit 84, a second voltage detection unit 82, a second current detection unit 86, a voltage conversion device 20, a control unit 88, and the like.
  • the first voltage detector 80 is configured as a known voltage detector, for example, and detects and outputs the voltage of the first conductive path 10. Specifically, a voltage output from the power supply device 1 to the first load 94 is detected, and a value reflecting the detected voltage (output voltage) (for example, the voltage of the first conductive path 10 itself or a divided value). Etc.) are output as detection values.
  • the first current detector 84 is configured as a known current detector, for example, and detects and outputs a current output from the power supply device 1 to the first load 94.
  • the resistor has a resistor and a differential amplifier interposed in the first conductive path 10, and the voltage across the resistor is input to the differential amplifier, and is generated in the resistor by the current flowing through the first conductive path 10. The amount of voltage drop is amplified by a differential amplifier and output as a detection value.
  • the second voltage detector 82 is configured as a known voltage detector, for example, and detects and outputs the voltage of the second conductive path 12. Specifically, a voltage output from the power supply device 1 to the second load 96 is detected, and a value reflecting the detected voltage (output voltage) (for example, the voltage itself of the second conductive path 12 or a divided value). Etc.) are output as detection values.
  • the second current detection unit 86 is configured as a known current detector, for example, and detects and outputs a current flowing through the second conductive path 12. Specifically, it has a resistor and a differential amplifier interposed in the second conductive path 12, and the voltage across the resistor is input to the differential amplifier, and is generated in the resistor by the current flowing through the second conductive path 12. The amount of voltage drop is amplified by a differential amplifier and output as a detection value.
  • the voltage converter 20 includes a plurality of first voltage converters 21 provided in parallel to each other, and is configured as a multiphase DCDC converter.
  • the voltage converter 20 has one end electrically connected to the first conductive path 10 and the other end electrically connected to the second conductive path 12, and the voltage applied to the first conductive path 10.
  • the voltage applied to the second conductive path 12 can be stepped down and the voltage applied to the second conductive path 12 can be stepped up and applied to the first conductive path 10.
  • the control unit 88 is a part that controls the operation of the voltage conversion device 20, and mainly includes a control circuit, a first drive unit 50, and a second drive unit 32.
  • the control circuit in the control unit 88 is configured as a microcomputer, for example, and includes an arithmetic device such as a CPU, a memory such as a ROM or a RAM, an AD converter, and the like.
  • the control unit 88 is supplied with power from the first power supply unit 90 or the second power supply unit 92.
  • the control unit 88 is electrically connected to the first voltage detection unit 80, the second voltage detection unit 82, the first current detection unit 84, and the second current detection unit 86, and acquires the detection value of each detection unit. obtain.
  • the control unit 88 has a function of determining a duty ratio based on the acquired detection value and a function of generating and outputting a PWM signal having the determined duty ratio.
  • the control unit 88 individually controls the plurality of first voltage conversion units 21 by generating the PWM signal SG1 and outputting the PWM signal SG1 to the first drive unit 50 provided in each of the first voltage conversion units 21.
  • the first voltage converter 21 (voltage converter 20) can be controlled to step up or step down.
  • the power supply device 1 includes a plurality of first voltage conversion units 21, a plurality of backflow prevention switching elements 24, a second inductor 26, a switching element 28, a capacitor 30, a second driving unit 32, and signal generation.
  • a circuit 34 and the like are provided.
  • a plurality (all) of the first voltage converters 21 are provided in parallel with each other.
  • Each of the first voltage converters 21 is configured as a synchronous rectification step-up / step-down DCDC converter.
  • the first voltage converter 21 steps down the voltage applied to the first conductive path 10 and applies it to the second conductive path 12.
  • a conversion operation may be performed.
  • each of the first voltage converters 21 has one end electrically connected to the first conductive path 10 and the other end electrically connected to the second conductive path 12.
  • Each of the first voltage converters 21 includes a high-side switching element 40, a low-side switching element 42, and a first inductor 44.
  • the switching element 40 is configured as an N-channel MOSFET, the first conductive path 10 is electrically connected to the drain, the drain of the switching element 42 and the one end of the first inductor 44 are connected to the source. Is connected.
  • a drain of the switching element 42 is connected to a connection point between the switching element 40 and the first inductor 44.
  • the source of the switching element 42 is electrically connected to the reference conductive path.
  • the switching element 40 corresponds to an example of a driving switching element.
  • the first voltage converters 21 each include a high-side capacitor 46 and a low-side capacitor 48.
  • One end of the capacitor 46 is connected to the first conductive path 10, and the other end is electrically connected to the reference conductive path.
  • One end of the capacitor 48 is connected to the second conductive path 12, and is connected to the other end of the first inductor 44 and one end of the second inductor 26 via the second conductive path 12. The other end of the capacitor 48 is electrically connected to the reference conductive path.
  • a plurality of first drive units 50 are provided respectively corresponding to the plurality of first voltage conversion units 21.
  • the first drive unit 50 corresponds to an example of a drive unit, and switches on signals (PWM signals) for alternately turning on each of the switching elements 40 and 42 based on the PWM signal SG1 generated by the control unit 88. Applied to the gates of the elements 40 and 42.
  • PWM signals signals for alternately turning on each of the switching elements 40 and 42 based on the PWM signal SG1 generated by the control unit 88.
  • the PWM signal output from the first drive unit 50 to the switching elements 40 and 42 corresponds to an example of a control signal.
  • the PWM signal output from the first driving unit 50 to the switching elements 40 and 42 is also referred to as a control signal.
  • the plurality (all) of the backflow prevention switching elements 24 have a configuration in which a plurality of semiconductor switching elements 24A, 24B, 24C... Are connected in parallel, and all of the semiconductor switching elements 24A, 24B, 24C. It has a function of interrupting the flow of current to the first voltage converter 21 side in the second conductive path 12 during the off operation.
  • each of the plurality of semiconductor switching elements 24A, 24B, 24C... Is configured as an N-channel type MOSFET, and each drain is on the second power supply section 92 side in the second conductive path 12.
  • Each of the sources is electrically connected to the conductive path on the first voltage conversion unit 21 side in the second conductive path 12.
  • the second inductor 26 is provided between the first voltage converter 21 and the backflow prevention switching element 24 in the second conductive path 12 and is provided in series with the backflow prevention switching element 24. Specifically, one end of the second inductor 26 is electrically connected to a connection point between the first inductor 44 and the capacitor 48 of each first voltage conversion unit 21, and the other end is a backflow prevention switching element. 24 sources and the drain of the switching element 28 are electrically connected.
  • the switching element 28 corresponds to an example of a semiconductor element unit, and is configured as, for example, a MOSFET.
  • the switching element 28 has a drain (one end) electrically connected between the second inductor 26 and the backflow prevention switching element 24 in the second conductive path 12 and a source (the other end) electrically connected to the reference conductive path. It is connected.
  • the capacitor 30 has one end connected to the second power source 92 side of the backflow prevention switching element 24 in the second conductive path 12 and the other end electrically connected to the reference conductive path.
  • the second voltage conversion unit 22 is configured by the backflow prevention switching element 24, the second inductor 26, and the switching element 28 (semiconductor element unit).
  • the second voltage converter 22 constitutes a synchronous rectification step-up / step-down DCDC converter.
  • the first voltage converter 21 side of the second conductive path 12 is used as the output conductive path 12B, and the first voltage converter
  • the side opposite to the 21 side is the input side conductive path 12A, and a second voltage conversion operation can be performed in which the voltage applied to the input side conductive path 12A is stepped down to apply the output voltage to the output side conductive path 12B.
  • the second drive unit 32 Based on the PWM signal SG ⁇ b> 2 generated by the control unit 88, the second drive unit 32 generates an on signal (PWM signal) for alternately turning on each of the backflow prevention switching element 24 and the switching element 28. Applied to the gates of the element 24 and the switching element 28.
  • the PWM signal output from the second drive unit 32 to the backflow prevention switching element 24 corresponds to an example of a second control signal.
  • the PWM signal that the second drive unit 32 outputs to the backflow prevention switching element 24 is also referred to as a control signal.
  • a control signal from the second drive unit 32 is directly applied to the gates of some of the backflow prevention switching elements 24A among the plurality of backflow prevention switching elements 24 (one in the first embodiment), The control signal from the second drive unit 32 is supplied to the other backflow prevention switching element 24B via the signal generation circuit 34.
  • the signal generation circuit 34 is provided between the second drive unit 32 and the gate of the backflow prevention switching element 24B.
  • the signal generation circuit 34 blocks the control signal output from the second drive unit 32 to the backflow prevention switching element 24B based on the blocking instruction signal SG3 output from the control unit 88.
  • a third conductive path 60 is provided between the second conductive path 12 and the first drive unit 50 and the second drive unit 32.
  • the third conductive path 60 is configured so that a part thereof is in parallel.
  • a diode 62 is provided in one conductive path configured in parallel, and a diode 64 and a voltage generation unit 66 are provided in the other conductive path. Is provided.
  • the diode 62 has an anode connected to the second conductive path 12 and a cathode connected to the first drive unit 50 and the second drive unit 32.
  • the voltage generation unit 66 is connected in series to the diode 64 and is provided on the second power supply unit 92 side of the diode 64.
  • the diode 64 has an anode connected to the voltage generation unit 66 and a cathode connected to the first drive unit 50 and the second drive unit 32.
  • the voltage generation unit 66 is configured as a booster circuit, for example, and boosts the voltage input from the second conductive path 12 side based on the boost instruction signal SG4 from the control unit 88 to boost the first drive unit 50 and the second drive unit 50. It can output to the drive part 32 side.
  • the operation of the power supply device 1 will be described.
  • the power supply device 1 switches the switch unit 98 from the off state to the on state in order to supply power from the first power supply unit 90 to the first load 94
  • a large current is suddenly applied to the capacitance component existing in the first load 94.
  • the operation of precharging the capacitive component of the first load 94 using the power of the second power supply unit 92 can be performed.
  • the control unit 88 is configured to repeatedly execute the precharge control shown in FIG. 3, and determines whether or not a predetermined precharge condition is satisfied with the start of the precharge control of FIG.
  • the precharge condition may be, for example, “the switch unit 98 (eg, the ignition switch) has been switched from the off state to the on state”, or may be a predetermined condition other than this.
  • the control unit 88 determines that the precharge condition is satisfied in step S1
  • the control unit 88 causes the second voltage conversion unit 22 to start the second voltage conversion operation in step S2.
  • the second voltage conversion unit 22 steps down the voltage applied to the input side conductive path 12A of the second conductive path 12 in accordance with a control signal given from the outside, and the output side conductive path 12B. It is the operation applied to. Specifically, it is realized as follows.
  • the control unit 88 determines whether or not the switching condition is satisfied in step S3 after starting the second voltage conversion operation in step S2. Specifically, in step S3, the control unit 88 determines whether or not the voltage of the first conductive path 10 is equal to or higher than a predetermined threshold based on the detection value of the first voltage detection unit 80, and the first conductive path If the voltage of 10 is less than the predetermined threshold value, the process proceeds to No in step S3. If the voltage of the first conductive path 10 is equal to or higher than the predetermined threshold value, the process proceeds to Yes in step S3, and the second voltage conversion operation is performed in step S4. To the third voltage conversion operation.
  • control unit 88 determines the duty ratio based on the detection value of the first voltage detection unit 80 or the first current detection unit 84, and generates the PWM signal SG2 having the determined duty ratio.
  • the PWM signal SG ⁇ b> 2 is output to the second drive unit 32.
  • the second drive unit 32 receiving the PWM signal SG2 outputs a control signal having a duty ratio of the PWM signal SG2 to one switching element 24A of the backflow prevention switching elements 24, and is complementary to the control signal.
  • the PWM signal is output to the switching element 28.
  • the synchronous rectification step-down operation in which the switching element 28 is turned off when the switching element 24A is turned on and the switching element 28 is turned on when the switching element 24 is turned off is reduced in dead time.
  • the control signal from the second drive unit 32 is also input to the signal generation circuit 34.
  • the signal generation circuit 34 When the signal SG3 is a cutoff instruction signal, the signal generation circuit 34 outputs an off signal to the switching elements 24B and 24C. At this time, the switching elements 24B and 24C are turned off. Further, when the signal SG3 is a permission signal, the signal generation circuit 34 outputs the same signal as the signal output from the second drive unit 32 to the gate of the switching element 24A to the switching elements 24B and 24C.
  • the control unit 88 is a signal that is input to the signal generation circuit 34 while the second voltage conversion unit 22 performs the second voltage conversion operation (while the control signal is output to the gate of the switching element 24A).
  • the switching elements 24B and 24C are maintained in the OFF state while the second voltage conversion unit 22 is performing the second voltage conversion operation. That is, while the second voltage conversion unit 22 is performing the second voltage conversion operation, the control signal output by the second drive unit 32 is output only to the switching element 24A, and the switching elements 24B and 24C are turned off. Since the state is maintained, only the switching element 24A is turned on / off.
  • the second voltage conversion unit 22 steps down the voltage applied to the input side conductive path 12A.
  • a second voltage conversion operation is performed so as to be applied to the output side conductive path 12B.
  • a feedback calculation is performed to calculate the duty so that the voltage applied to the first conductive path 10 approaches a desired target voltage lower than the output voltage when the second power supply unit 92 is fully charged.
  • the control is repeated so that the voltage applied to the first conductive path 10 approaches the desired target voltage.
  • the capacitance component of the first load 94 is charged.
  • step S3 When it is determined that the predetermined switching condition is satisfied in step S3, that is, when it is determined that the voltage of the first conductive path 10 is equal to or higher than the predetermined threshold, the control unit 88 in step S4, the second voltage conversion unit 22 is determined. The second voltage conversion operation by is terminated, and the third voltage conversion operation by the first voltage conversion unit 21 is started. The third voltage conversion operation performs a synchronous rectification boosting operation in the voltage conversion device 20 by alternately applying an ON signal based on the PWM signal SG1 to the switching elements 40 and 42 from the first drive unit 50, In this operation, the voltage applied to the second conductive path 12 is boosted and applied to the first conductive path 10.
  • the control unit 88 stops outputting the cutoff instruction signal SG3 to the signal generation circuit 34 and outputs an ON signal to the second drive unit 32.
  • the second drive unit 32 receiving this ON signal outputs an ON signal to all the switching elements 24A, 24B, 24C,... Constituting the backflow prevention switching element 24 and outputs an OFF signal to the switching element 28. To do. Therefore, during the third voltage conversion operation, all the switching elements 24A, 24B, 24C... Constituting the backflow prevention switching element 24 are maintained in the on state, and the switching element 28 is maintained in the off state.
  • the control unit 88 determines the duty ratio based on the detection value of the first voltage detection unit 80 or the first current detection unit 84, and generates the PWM signal SG1 having the determined duty ratio. Specifically, the feedback calculation for calculating the duty is repeated so that the voltage applied to the first conductive path 10 approaches a desired target voltage that is higher than the output voltage when the second power supply unit 92 is fully charged, Control is performed so that the voltage applied to the conductive path 10 approaches a desired target voltage.
  • the control unit 88 outputs the PWM signal SG ⁇ b> 1 generated in this way only to the first drive unit 50 corresponding to one first voltage conversion unit 21 among the plurality of first voltage conversion units 21.
  • the first drive unit 50 having received the PWM signal SG1 outputs a control signal having a duty ratio of the PWM signal SG1 to the switching element 42 and switches a control signal complementary to the control signal (PWM signal SG1). Output to the element 40. That is, when the switching element 42 is turned on, the switching element 40 is turned off, and when the switching element 42 is turned off, the synchronous rectification control that turns on the switching element 40 sets the dead time. Execute in the form.
  • the control unit 88 outputs an off signal to the first drive unit 50 of the other first voltage conversion unit 21 among the plurality of first voltage conversion units 21.
  • the first driving unit 50 to which the off signal is input maintains the corresponding switching elements 40 and 42 in the off state.
  • a third voltage conversion operation is performed in which the voltage applied to the second conductive path 12 is boosted and applied to the first conductive path 10.
  • charges can be further accumulated with respect to the capacitance component of the first load 94 in which charges are accumulated in the second voltage conversion operation, and the charge voltage of the capacitance component is further increased. Can do.
  • control unit 88 determines whether or not a predetermined precharge end condition is satisfied in step S5.
  • the predetermined precharge end condition is, for example, “the voltage of the first conductive path 10 exceeds a predetermined voltage”.
  • step S5 When it is determined in step S5 that the precharge end condition is not satisfied, the control unit 88 repeats step S5 until the precharge end condition is satisfied. During this time, charging of the capacitive component of the first load 94 proceeds.
  • step S5 the control unit 88 ends the third voltage conversion operation in step S6. That is, the output of the PWM signal SG1, the PWM signal SG2, the cutoff instruction signal SG3, and the boost instruction signal SG4 is stopped. Thereby, the precharge to the first load 94 is completed.
  • the control unit 88 switches the switch unit 98 from the off state to the on state after finishing the third voltage conversion operation in step S6.
  • the switch unit 98 can be switched to the on state while the capacity component of the first load 94 is charged to some extent, a situation in which a large current flows into the capacity component of the first load 94 is unlikely to occur.
  • the voltage converter 20 performs the above-described step-down operation, and steps down the voltage applied to the first conductive path 10 to reduce the second conductive path. It is sufficient to function so as to apply a desired output voltage.
  • the control unit 88 outputs the boost instruction signal SG4 to the voltage generation unit 66 during the first voltage conversion operation, the second voltage conversion operation, or the third voltage conversion operation.
  • the voltage generation unit 66 boosts the input voltage (voltage applied to the second conductive path 12) and outputs it to the anode side of the diode 64 during the period when the boost instruction signal SG4 is given.
  • the control unit 88 may output the boost instruction signal SG4 during any or all of the periods during the first voltage conversion operation, the second voltage conversion operation, and the third voltage conversion operation.
  • the boost instruction signal SG4 may be output only when the voltage applied to the two conductive paths 12 is equal to or lower than a predetermined value.
  • the second voltage conversion unit 22 is configured to include the backflow prevention switching element 24, the second inductor 26, and the switching element 28 (semiconductor element unit).
  • the first voltage conversion unit 21 side from itself is the output side conductive path 12B
  • the opposite side of the first voltage conversion unit 21 side is the input side conductive path 12A
  • the input side conductive path A second voltage conversion operation is performed in which the voltage applied to 12A is stepped down to apply the output voltage to the output-side conductive path 12B.
  • the backflow prevention switching element 24 has a configuration in which a plurality of semiconductor switching elements 24A, 24B, 24C,...
  • control unit 88 responds when a predetermined precharge condition is established.
  • the second control signal in which the ON signal and the OFF signal are alternately switched is given to only some of the plurality of semiconductor switching elements 24A, 24B, 24C... Constituting the backflow prevention switching element 24. Then, the second voltage conversion unit 22 is caused to perform the second voltage conversion operation.
  • the power supply device 1 can cause the second voltage conversion unit 22 to perform the second voltage conversion operation in accordance with the establishment of the predetermined precharge condition. Therefore, at least the second voltage conversion operation is performed as described above. If the switch unit 98 is switched from the off state to the on state after the switch is performed, the switch unit 98 is switched from the off state to the on state in a state where the charging of the capacitance component has progressed to some extent. The inrush current flowing into the capacitive component from the first power supply unit 90 immediately after switching can be suppressed.
  • control unit 88 causes the second voltage conversion unit 22 to perform the second voltage conversion operation in response to the establishment of a predetermined precharge condition
  • a plurality of semiconductor switching elements 24A constituting the backflow prevention switching element 24 are provided. , 24B, 24C,..., 24B, 24C,..., “A control unit for driving the backflow prevention switching element 24 in association with the second voltage conversion operation. It is possible to suppress the “power required by 88”. Therefore, even when the voltage of the power supply that supplies power to the control unit 88 is reduced, it is difficult for the control unit 88 to perform the precharge operation control (control of the second voltage conversion operation).
  • the power supply device 1 includes a plurality of third conductive paths 60 serving as power supply paths from the second conductive paths 12 to the control unit 88.
  • the plurality of third conductive paths 60 are connected in parallel between the second conductive path 12 and the control unit 88, and any of the third conductive paths 60 is connected to a conductive path on the second conductive path 12 side.
  • a voltage generation unit 66 is provided that boosts the applied voltage and applies an output voltage to the conductive path on the control unit 88 side. According to this configuration, even when the voltage applied to the second conductive path 12 is small, the voltage generating unit 66 boosts the voltage applied to the conductive path on the second conductive path 12 side to increase the control unit. An output voltage can be applied to the conductive path on the 88 side. Therefore, even when the voltage applied to the second conductive path 12 is small, a drive voltage necessary for the operation of the control unit 88 is easily secured.
  • control unit 88 applies only to one semiconductor switching element among the plurality of semiconductor switching elements 24A, 24B, 24C,... Constituting the backflow prevention switching element 24 in response to establishment of a predetermined precharge condition.
  • a second control signal is given to cause the second voltage converter 22 to perform a second voltage conversion operation. According to this configuration, since the number of driving semiconductor switching elements can be minimized when performing the second voltage conversion operation, the power consumed during the second voltage conversion operation can be further reduced. Can do.
  • the semiconductor element portion is the switching element 28. Therefore, for example, when the switching element 28 is turned on, when a current smaller than the critical current of the second inductor 26 or the first inductor 44 flows, the reverse direction generated in the second inductor 26 or the first inductor 44 is generated.
  • a current hereinafter also referred to as a reverse current
  • the reverse current can be passed through the reference conductive path without being stored in the switching element 28. Accordingly, when the second voltage conversion operation is performed, the reverse current is prevented from being applied to the output from the backflow prevention switching element 24, and therefore the output width (duty) of the backflow prevention switching element 24 is reversed. Unintentional change due to the direction current can be suppressed.
  • control unit 88 turns on the driving switching element 40 during a period in which the second voltage conversion unit 22 performs the second voltage conversion operation. In this way, the voltage drop that occurs in the drive switching element 40 during the second voltage conversion operation can be further reduced.
  • an FET is used as the switching element 40, and the second conductive path is set with the switching element 40 (FET) turned off during the second voltage conversion operation and only the FET body diode is used as a current-carrying path.
  • FET switching element 40
  • the switching element 40 is turned on, this loss can be reliably reduced. Note that the switching element 42 may be maintained in the off state during the second voltage conversion operation.
  • control signal is output to only one of the plurality of backflow prevention switching elements 24 in the second voltage conversion operation, but two or more backflow prevention switching elements may be used in some cases.
  • the control signal may be output to 24.
  • the first power supply unit 90 (first load 94) side is set to the high voltage side
  • the second power supply unit 92 (second load 96) side is set to the low voltage side
  • the load 94) side may be the low voltage side
  • the second power supply unit 92 (second load 96) side may be the high voltage side. That is, the present invention can be applied to a configuration in which a low voltage side capacitance component is precharged.
  • the voltage generation unit 66 is provided in the third conductive path 60, but the voltage generation unit 66 may not be provided.
  • the control signal is output only to the switching element 40 of one first voltage conversion unit 21 among the plurality of first voltage conversion units 21. If it is the switching element 40 of the 1 voltage conversion part 21, you may make it output a control signal to the switching element 40 of two or more 1st voltage conversion parts 21.
  • the semiconductor element portion is a switching element, but may be a diode.
  • the anode is electrically connected to the reference conductive path
  • the cathode is electrically connected between the second inductor 26 and the backflow prevention switching element 24 in the second conductive path 12, and the second voltage conversion is performed.
  • the unit 22 may function as a diode-type DCDC converter.

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  • Life Sciences & Earth Sciences (AREA)
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Abstract

The present invention suppresses, even if the voltage of a power supply lowers, the occurrence of a situation in which a control unit receiving power supplied from this power supply cannot control a precharge operation. In the power supply device (1), a reverse-flow prevention switching element (24) has a configuration in which a plurality of semiconductor switching elements (24A, 24B, 24C) are connected in parallel with each other. In accordance with the establishment of a predetermined precharge condition, a control unit (88) provides a second control signal, by which an ON-signal and an OFF-signal are alternately switched, to only some of the plurality of semiconductor switching elements (24A, 24B, 24C) constituting the reverse-flow prevention switching element (24), thereby instructing a second voltage conversion unit (22) to perform a second voltage conversion operation.

Description

車載用の電源装置In-vehicle power supply
　本発明は、車載用の電源装置に関するものである。 The present invention relates to an in-vehicle power supply device.
　蓄電池を備えた車両では、蓄電池の消費電流を抑制するために、ＩＧオフ時などにこの蓄電池とこの蓄電池に接続された負荷とを切り離して待機することがある。この待機状態のとき、この負荷内の容量成分に蓄えられていた電荷が放電され、蓄電池の端子電圧と負荷の電圧の差が大きくなる。蓄電池の端子電圧とこの負荷の電圧との差が大きい状態で蓄電池とこの負荷とを接続すると、蓄電池とこの負荷との間で大きな突入電流が生じてしまう。 In a vehicle equipped with a storage battery, in order to reduce the current consumption of the storage battery, the storage battery and a load connected to the storage battery may be separated and stand by when the IG is off. In this standby state, the charge stored in the capacity component in the load is discharged, and the difference between the terminal voltage of the storage battery and the voltage of the load increases. If the storage battery and the load are connected in a state where the difference between the terminal voltage of the storage battery and the voltage of the load is large, a large inrush current is generated between the storage battery and the load.
　この種の問題を解決するための技術としては、特許文献１のような技術が提案されている。特許文献１の技術では、蓄電池と負荷とを接続する前に、昇圧型のＤＣＤＣコンバータを利用して負荷内の容量成分をプリチャージすることにより、蓄電池と負荷との間で大きな突入電流が生じることを抑えている。 As a technique for solving this type of problem, a technique as described in Patent Document 1 has been proposed. In the technique of Patent Document 1, a large inrush current is generated between the storage battery and the load by precharging the capacity component in the load using a step-up DCDC converter before connecting the storage battery and the load. That is holding down.
特開２０１７－２２８０５号公報JP 2017-22805 A
　ところで、ＤＣＤＣコンバータによってプリチャージを行うためには、電圧変換動作を行う主要素となるスイッチング素子をドライバによって駆動しなければならず、そのためにはドライバに対して電力を供給する必要がある。一方、近年では、ＤＣＤＣコンバータに要求される性能を満たすために、複数のスイッチング素子を並列にして利用したり、コンバータを並列に接続して多相化したりする構成が用いられており、このような並列数の増加等により、ドライバを介してスイッチング素子等に出力される電流（駆動電流）は増加する傾向にある。この結果、ドライバに電力を供給する電源とドライバとの間の経路に介在する抵抗成分やダイオード成分において、より大きな電圧降下が生じやすくなり、電源電圧（ドライバに電力を供給するための電源の電圧）が低下した場合に、ドライバが動作するために必要な大きさの電圧（閾値電圧）を満たせなくなるおそれがある。 By the way, in order to perform precharge by the DCDC converter, the switching element which is a main element for performing the voltage conversion operation must be driven by the driver, and for that purpose, it is necessary to supply power to the driver. On the other hand, in recent years, in order to satisfy the performance required for a DCDC converter, a configuration in which a plurality of switching elements are used in parallel or a converter is connected in parallel to be multiphased is used. Due to the increase in the number of parallel connections, etc., the current (drive current) output to the switching element via the driver tends to increase. As a result, a larger voltage drop is likely to occur in the resistance component and the diode component interposed in the path between the power source that supplies power to the driver and the driver, and the power source voltage (the voltage of the power source for supplying power to the driver) ) Decreases, the voltage (threshold voltage) necessary for the driver to operate may not be satisfied.
　本発明は上述した課題の少なくとも一つを解決するためになされたものであり、電源電圧が低下しても、この電源から電力供給を受ける制御部がプリチャージ動作の制御を行えない事態が発生することを抑制し得る車載用の電源装置を実現することを目的とするものである。 The present invention has been made to solve at least one of the above-described problems, and even when the power supply voltage is lowered, a situation occurs in which the control unit that receives power supply from the power supply cannot control the precharge operation. An object of the present invention is to realize an in-vehicle power supply device that can suppress this.
　本発明の第１態様である車載用の電源装置は、
　第１電源部からの電力が第１導電路を介して供給される構成をなし、第２電源部からの電力が第２導電路を介して供給される構成をなし、容量成分が前記第１導電路に電気的に接続され、前記第１電源部と前記容量成分との間に前記第１電源部から前記容量成分側への通電を許容するオン状態と遮断するオフ状態とに切り替わるスイッチ部が設けられた車載用の電源システムにおいて、前記第１導電路に印加された電圧を降圧して第２導電路に印加、または前記第２導電路に印加された電圧を昇圧して前記第１導電路に印加する車載用の電源装置であって、
　オン信号とオフ信号とが交互に切り替えられる第１制御信号が与えられることに応じてオンオフ動作する駆動用スイッチング素子及び第１インダクタを備え、前記駆動用スイッチング素子のオンオフ動作により前記第１導電路に印加された電圧を降圧して前記第２導電路に印加する第１の電圧変換動作を行う第１電圧変換部と、
　前記第２導電路に設けられ、オフ動作時に前記第２導電路における前記第１電圧変換部側への電流の流れ込みを遮断する逆流防止用スイッチング素子と、
　前記第２導電路における前記第１電圧変換部と前記逆流防止用スイッチング素子との間に設けられ、前記逆流防止用スイッチング素子に対して直列に設けられる第２インダクタと、
　一端が前記第２導電路における前記第２インダクタと前記逆流防止用スイッチング素子との間に電気的に接続され、他端が基準導電路に電気的に接続されるダイオード又はスイッチング素子からなる半導体素子部と、
　少なくとも前記駆動用スイッチング素子に対して前記第１制御信号を出力する制御部と、
　を備え、
　前記逆流防止用スイッチング素子と前記第２インダクタと前記半導体素子部とを備え、前記第２導電路において、自身よりも前記第１電圧変換部側を出力側導電路とし、前記第１電圧変換部側とは反対側を入力側導電路とし、前記入力側導電路に印加された電圧を降圧して前記出力側導電路に出力電圧を印加する第２の電圧変換動作を行う第２電圧変換部が構成され、
　前記逆流防止用スイッチング素子は、複数の半導体スイッチング素子が並列に接続された構成をなし、
　前記制御部は、所定のプリチャージ条件の成立に応じて、前記逆流防止用スイッチング素子を構成する複数の前記半導体スイッチング素子のうちの一部の素子にのみオン信号とオフ信号とが交互に切り替わる第２制御信号を与えることで、前記第２電圧変換部に第２の電圧変換動作を行わせる。 The in-vehicle power supply device according to the first aspect of the present invention,
The power supply from the first power supply unit is configured to be supplied through the first conductive path, the power from the second power supply unit is configured to be supplied through the second conductive path, and the capacitance component is the first. A switch unit that is electrically connected to a conductive path and switches between an on state that allows energization from the first power source unit to the capacitive component side and an off state that blocks the current between the first power source unit and the capacitive component. The voltage applied to the first conductive path is stepped down and applied to the second conductive path, or the voltage applied to the second conductive path is boosted and the first conductive path is provided. An in-vehicle power supply device applied to a conductive path,
A drive switching element and a first inductor that perform an on / off operation in response to a first control signal that is alternately switched between an on signal and an off signal are provided, and the first conductive path is turned on and off by the drive switching element. A first voltage conversion unit that performs a first voltage conversion operation of stepping down a voltage applied to the second conductive path and applying it to the second conductive path;
A backflow preventing switching element that is provided in the second conductive path and blocks the flow of current to the first voltage conversion unit in the second conductive path during an off operation;
A second inductor provided between the first voltage conversion unit and the backflow prevention switching element in the second conductive path, and provided in series with the backflow prevention switching element;
A semiconductor element comprising a diode or a switching element having one end electrically connected between the second inductor and the backflow preventing switching element in the second conductive path and the other end electrically connected to a reference conductive path And
A control unit for outputting the first control signal to at least the driving switching element;
With
The switching element for preventing backflow, the second inductor, and the semiconductor element unit, and in the second conductive path, the first voltage conversion unit side of the second conductive path is an output side conductive path, and the first voltage conversion unit A second voltage conversion unit that performs a second voltage conversion operation in which a side opposite to the input side is an input side conductive path, and a voltage applied to the input side conductive path is stepped down to apply an output voltage to the output side conductive path Is configured,
The backflow prevention switching element has a configuration in which a plurality of semiconductor switching elements are connected in parallel,
The control unit alternately switches an on signal and an off signal to only a part of the plurality of semiconductor switching elements constituting the backflow prevention switching element according to establishment of a predetermined precharge condition. By supplying the second control signal, the second voltage conversion unit is caused to perform a second voltage conversion operation.
　第１態様の車載用の電源装置は、所定のプリチャージ条件の成立に応じて第２電圧変換部に第２の電圧変換動作を行わせることができるため、少なくともこのように第２の電圧変換動作が行われた後にスイッチ部がオフ状態からオン状態に切り替えられる状況であれば、容量成分の充電がある程度進行した状況でスイッチ部がオフ状態からオン状態に切り替えられることになるため、その切り替え直後に第１電源部から容量成分に流れ込む突入電流を抑えることができる。
　しかも、所定のプリチャージ条件の成立に応じて制御部が第２電圧変換部に第２の電圧変換動作を行わせる場合に、逆流防止用スイッチング素子を構成する複数の半導体スイッチング素子のうちの一部の素子にのみ第２制御信号を与える構成であるため、「第２の電圧変換動作に伴って逆流防止用スイッチング素子を駆動するために制御部で必要となる電力」を抑えることができる。ゆえに、制御部に電力を与える電源の電圧が低下しても、制御部がプリチャージ動作の制御（第２の電圧変換動作の制御）を行えない事態は発生しにくくなる。 The in-vehicle power supply device according to the first aspect can cause the second voltage conversion unit to perform the second voltage conversion operation in response to the establishment of the predetermined precharge condition, so that at least the second voltage conversion is performed in this way. If the switch unit is switched from the off state to the on state after the operation is performed, the switch unit is switched from the off state to the on state in a state where the charging of the capacitance component has progressed to some extent. Immediately after that, an inrush current flowing into the capacitive component from the first power supply unit can be suppressed.
In addition, when the control unit causes the second voltage conversion unit to perform the second voltage conversion operation in response to establishment of a predetermined precharge condition, one of the plurality of semiconductor switching elements constituting the backflow prevention switching element. Since the second control signal is applied only to the element of the part, “the power necessary for the control part to drive the switching element for preventing the backflow accompanying the second voltage conversion operation” can be suppressed. Therefore, even when the voltage of the power source that supplies power to the control unit decreases, it is difficult for the control unit to perform the control of the precharge operation (control of the second voltage conversion operation).
実施例１の車載用の電源装置を備えた車載用電源システムの構成を概略的に例示するブロック図である。1 is a block diagram schematically illustrating a configuration of an in-vehicle power supply system including an in-vehicle power supply device according to a first embodiment. 車載用の電源装置に含まれる電圧変換装置の構成を具体的に例示したブロック図である。It is the block diagram which illustrated concretely the composition of the voltage converter contained in the in-vehicle power supply device. 車載用の電源装置に含まれる制御部によってなされるプリチャージの流れを例示したフローチャートである。It is the flowchart which illustrated the flow of the pre-charge performed by the control part contained in the vehicle-mounted power supply device.
　本発明の車載用の電源装置は、第２導電路から制御部への電力供給経路となる複数の第３導電路を備えていてもよい。そして、複数の第３導電路は、第２導電路と制御部との間に並列に接続され、いずれかの第３導電路には、第２導電路側の導電路に印加された電圧を昇圧して制御部側の導電路に出力電圧を印加する電圧生成部が設けられていてもよい。
　この構成によれば、第２導電路に印加された電圧が小さい場合であっても、電圧生成部は、第２導電路側の導電路に印加された電圧を昇圧して制御部側の導電路に出力電圧を印加することができる。よって、第２導電路に印加された電圧が小さい場合であっても、制御部の動作に必要な駆動電圧が確保されやすくなる。 The in-vehicle power supply device of the present invention may include a plurality of third conductive paths that serve as power supply paths from the second conductive paths to the control unit. The plurality of third conductive paths are connected in parallel between the second conductive path and the control unit, and the voltage applied to the conductive path on the second conductive path side is boosted to any of the third conductive paths. Then, a voltage generation unit that applies an output voltage to the conductive path on the control unit side may be provided.
According to this configuration, even when the voltage applied to the second conductive path is small, the voltage generation unit boosts the voltage applied to the conductive path on the second conductive path side to increase the voltage on the control unit side. An output voltage can be applied. Therefore, even when the voltage applied to the second conductive path is small, it is easy to ensure the drive voltage necessary for the operation of the control unit.
　制御部は、所定のプリチャージ条件の成立に応じて、逆流防止用スイッチング素子を構成する複数の半導体スイッチング素子のうちの１つの半導体スイッチング素子にのみ第２制御信号を与え、第２電圧変換部に第２の電圧変換動作を行わせるようにしてもよい。
　この構成によれば、第２の電圧変換動作を行う際に半導体スイッチング素子の駆動数を最小限に抑えることができるため、第２の電圧変換動作の際に消費する電力をより一層小さく抑えることができる。 The control unit applies the second control signal only to one semiconductor switching element among the plurality of semiconductor switching elements constituting the backflow prevention switching element in response to establishment of a predetermined precharge condition, and the second voltage conversion unit The second voltage conversion operation may be performed.
According to this configuration, since the number of driving semiconductor switching elements can be minimized when performing the second voltage conversion operation, the power consumed during the second voltage conversion operation can be further reduced. Can do.
　また、本発明の車載用の電源装置において、半導体素子部は、スイッチング素子としてもよい。
　この構成によれば、例えば、スイッチング素子をオン状態にすることによって、第２インダクタや第１インダクタの臨界電流より小さな電流が流れた場合に第２インダクタや第１インダクタに生じる逆向きの電流（以降、逆向き電流ともいう）をスイッチング素子に蓄電することなく基準導電路に流すことができる。これにより、第２の電圧変換動作を行う場合、逆流防止用スイッチング素子からの出力に逆向き電流が加わることが防止されるため、逆流防止用スイッチング素子の出力の幅（デューティ）が逆向き電流によって意図せずに変化してしまうことを抑えることができる。 In the in-vehicle power supply device of the present invention, the semiconductor element unit may be a switching element.
According to this configuration, for example, when the switching element is turned on, when a current smaller than the critical current of the second inductor or the first inductor flows, the reverse current generated in the second inductor or the first inductor ( Hereinafter, the reverse current) can be passed through the reference conductive path without being stored in the switching element. As a result, when the second voltage conversion operation is performed, the reverse current is prevented from being applied to the output from the backflow prevention switching element. Therefore, the output width (duty) of the backflow prevention switching element is the reverse current. Can prevent unintentional changes.
　また、本発明の車載用の電源装置において、制御部は、第２電圧変換部に第２の電圧変換動作を行わせる期間に、駆動用スイッチング素子をオン状態にする。このようにすれば、第２の電圧変換動作の際に駆動用スイッチング素子で生じる電圧降下をより小さく抑えることができる。 Further, in the in-vehicle power supply device of the present invention, the control unit turns on the driving switching element during a period in which the second voltage conversion unit performs the second voltage conversion operation. In this way, the voltage drop that occurs in the drive switching element during the second voltage conversion operation can be further reduced.
　例えば、駆動用スイッチング素子としてＦＥＴを用い、第２の電圧変換動作の際にＦＥＴをオフ状態にするとともにＦＥＴのボディダイオードのみを通電経路として第２導電路側から第１導電路側へと電流を流す方法も考えられるが、この方法では、ボディダイオードでの損失が懸念される。しかし、第２電圧変換部に第２の電圧変換動作を行わせる期間に駆動用スイッチング素子をオン状態にすれば、この損失を確実に低減することができる。 For example, an FET is used as the driving switching element, and the FET is turned off during the second voltage conversion operation, and the current flows from the second conductive path side to the first conductive path side using only the FET body diode as the energization path. Although a method is also conceivable, there is a concern about loss in the body diode. However, if the driving switching element is turned on during the period in which the second voltage conversion unit performs the second voltage conversion operation, this loss can be reliably reduced.
＜実施例１＞
　以下、本発明を具体化した実施例１について説明する。
　実施例１の車載用の電源装置１（以下、電源装置１ともいう）は、図１で示す車載用電源システム１００（以下、電源システム１００ともいう）の一部をなすものである。電源システム１００は、第１電源部９０、第２電源部９２、第１負荷９４、第２負荷９６、電源装置１などを備える。電源システム１００は、第１電源部９０を電力供給源として第１負荷９４に電力を供給し得るとともに、イグニッションスイッチオフ時などに放電した第１負荷９４の容量成分に、第２電源部９２を電力供給源とし電源装置１を介して蓄電（プリチャージ）し得るシステムとして構成されている。 <Example 1>
Embodiment 1 of the present invention will be described below.
The vehicle-mounted power supply device 1 (hereinafter also referred to as the power supply device 1) according to the first embodiment is a part of the vehicle-mounted power supply system 100 (hereinafter also referred to as the power supply system 100) illustrated in FIG. The power supply system 100 includes a first power supply unit 90, a second power supply unit 92, a first load 94, a second load 96, the power supply device 1, and the like. The power supply system 100 can supply power to the first load 94 using the first power supply unit 90 as a power supply source, and the second power supply unit 92 is added to the capacity component of the first load 94 discharged when the ignition switch is turned off. The system is configured as a power supply source that can be charged (precharged) via the power supply device 1.
　第１電源部９０は、第１負荷９４又は第２負荷９６に電力を供給し得る部分であり、例えばリチウムイオン電池等の公知の車載バッテリとして構成されている。第１電源部９０は、高電位側の端子が第１導電路１０に電気的に接続されており、低電位側の端子が図示しない基準導電路（グラウンド部）に電気的に接続されており、第１導電路１０に対して所定の出力電圧を印加する。第１電源部９０は、第１導電路１０に設けられたスイッチ部９８がオフ状態からオン状態に切り替わると、第１導電路１０を介して、第１負荷９４及び電源装置１に電気的に接続される。 The first power supply unit 90 is a portion that can supply power to the first load 94 or the second load 96, and is configured as a known vehicle-mounted battery such as a lithium ion battery. The first power supply unit 90 has a high potential side terminal electrically connected to the first conductive path 10 and a low potential side terminal electrically connected to a reference conductive path (ground portion) (not shown). A predetermined output voltage is applied to the first conductive path 10. The first power supply unit 90 is electrically connected to the first load 94 and the power supply device 1 through the first conductive path 10 when the switch unit 98 provided in the first conductive path 10 is switched from the off state to the on state. Connected.
　第２電源部９２は、第１負荷９４又は第２負荷９６に電力を供給し得る部分であり、例えば鉛バッテリ等の公知の車載バッテリとして構成されている。第２電源部９２は、高電位側の端子が第２導電路１２に電気的に接続されており、低電位側の端子が図示しないグラウンド部に電気的に接続されており、第２導電路１２に対して所定の出力電圧を印加する。第２電源部９２は第２導電路１２を介して、第２負荷９６及び電源装置１に電気的に接続される。 The second power supply unit 92 is a part that can supply power to the first load 94 or the second load 96, and is configured as a known vehicle-mounted battery such as a lead battery. The second power supply unit 92 has a high potential side terminal electrically connected to the second conductive path 12 and a low potential side terminal electrically connected to a ground portion (not shown). A predetermined output voltage is applied to 12. The second power supply unit 92 is electrically connected to the second load 96 and the power supply device 1 through the second conductive path 12.
　第１負荷９４は、容量成分を含んでおり、この容量成分が本発明の容量成分の一例に相当する。第１負荷９４は、第１導電路１０に電気的に接続されており、第１導電路１０を介して電源装置１に接続されている。容量成分は、コンデンサなどであってもよく、その他の容量成分であってもよい。 The first load 94 includes a capacitive component, and this capacitive component corresponds to an example of the capacitive component of the present invention. The first load 94 is electrically connected to the first conductive path 10 and is connected to the power supply device 1 via the first conductive path 10. The capacitance component may be a capacitor or the like, or may be another capacitance component.
　第２負荷９６は、容量成分を含んでいる。第２負荷９６は、第２導電路１２に電気的に接続されており、第２導電路１２を介して電源装置１に接続されている。 The second load 96 includes a capacitive component. The second load 96 is electrically connected to the second conductive path 12 and is connected to the power supply device 1 via the second conductive path 12.
　電源装置１は、第１導電路１０に印加された電圧を降圧して第２導電路１２に印加し得るとともに、第２導電路１２に印加された電圧を昇圧又は降圧して第１導電路１０に印加し得る装置として構成されている。電源装置１は、第１電圧検出部８０、第１電流検出部８４、第２電圧検出部８２、第２電流検出部８６、電圧変換装置２０、制御部８８などを備える。 The power supply device 1 can step down the voltage applied to the first conductive path 10 and apply it to the second conductive path 12, and step up or step down the voltage applied to the second conductive path 12. 10 is configured as a device that can be applied. The power supply device 1 includes a first voltage detection unit 80, a first current detection unit 84, a second voltage detection unit 82, a second current detection unit 86, a voltage conversion device 20, a control unit 88, and the like.
　第１電圧検出部８０は、例えば公知の電圧検出器として構成されており、第１導電路１０の電圧を検出して出力する。具体的には、電源装置１から第１負荷９４に出力される電圧を検出して、検出した電圧（出力電圧）を反映した値（例えば、第１導電路１０の電圧そのもの、或いは分圧値等）を検出値として出力する。 The first voltage detector 80 is configured as a known voltage detector, for example, and detects and outputs the voltage of the first conductive path 10. Specifically, a voltage output from the power supply device 1 to the first load 94 is detected, and a value reflecting the detected voltage (output voltage) (for example, the voltage of the first conductive path 10 itself or a divided value). Etc.) are output as detection values.
　第１電流検出部８４は、例えば公知の電流検出器として構成されており、電源装置１から第１負荷９４に出力される電流を検出して出力する。具体的には、第１導電路１０に介在する抵抗器と差動増幅器とを有し、抵抗器の両端電圧が差動増幅器に入力され、第１導電路１０を流れる電流によって抵抗器に生じた電圧降下量が差動増幅器で増幅され、検出値として出力されるようになっている。 The first current detector 84 is configured as a known current detector, for example, and detects and outputs a current output from the power supply device 1 to the first load 94. Specifically, the resistor has a resistor and a differential amplifier interposed in the first conductive path 10, and the voltage across the resistor is input to the differential amplifier, and is generated in the resistor by the current flowing through the first conductive path 10. The amount of voltage drop is amplified by a differential amplifier and output as a detection value.
　第２電圧検出部８２は、例えば公知の電圧検出器として構成されており、第２導電路１２の電圧を検出して出力する。具体的には、電源装置１から第２負荷９６に出力される電圧を検出して、検出した電圧（出力電圧）を反映した値（例えば、第２導電路１２の電圧そのもの、或いは分圧値等）を検出値として出力する。 The second voltage detector 82 is configured as a known voltage detector, for example, and detects and outputs the voltage of the second conductive path 12. Specifically, a voltage output from the power supply device 1 to the second load 96 is detected, and a value reflecting the detected voltage (output voltage) (for example, the voltage itself of the second conductive path 12 or a divided value). Etc.) are output as detection values.
　第２電流検出部８６は、例えば公知の電流検出器として構成されており、第２導電路１２を流れる電流を検出して出力する。具体的には、第２導電路１２に介在する抵抗器と差動増幅器とを有し、抵抗器の両端電圧が差動増幅器に入力され、第２導電路１２を流れる電流によって抵抗器に生じた電圧降下量が差動増幅器で増幅され、検出値として出力されるようになっている。 The second current detection unit 86 is configured as a known current detector, for example, and detects and outputs a current flowing through the second conductive path 12. Specifically, it has a resistor and a differential amplifier interposed in the second conductive path 12, and the voltage across the resistor is input to the differential amplifier, and is generated in the resistor by the current flowing through the second conductive path 12. The amount of voltage drop is amplified by a differential amplifier and output as a detection value.
　電圧変換装置２０は、互いに並列に設けられた複数の第１電圧変換部２１を有しており、多相型のＤＣＤＣコンバータとして構成されている。電圧変換装置２０は、一端が第１導電路１０に電気的に接続されているとともに、他端が第２導電路１２に電気的に接続されており、第１導電路１０に印加された電圧を降圧して第２導電路１２に印加し得るとともに、第２導電路１２に印加された電圧を昇圧して第１導電路１０に印加し得る構成をなす。 The voltage converter 20 includes a plurality of first voltage converters 21 provided in parallel to each other, and is configured as a multiphase DCDC converter. The voltage converter 20 has one end electrically connected to the first conductive path 10 and the other end electrically connected to the second conductive path 12, and the voltage applied to the first conductive path 10. The voltage applied to the second conductive path 12 can be stepped down and the voltage applied to the second conductive path 12 can be stepped up and applied to the first conductive path 10.
　制御部８８は、電圧変換装置２０の動作を制御する部分であり、主として、制御回路と、第１駆動部５０と、第２駆動部３２とを備えた構成をなす。制御部８８において制御回路は、例えばマイクロコンピュータとして構成されており、ＣＰＵ等の演算装置、ＲＯＭ又はＲＡＭ等のメモリ、ＡＤ変換器等を有している。制御部８８には、第１電源部９０又は第２電源部９２から電力が供給される。 The control unit 88 is a part that controls the operation of the voltage conversion device 20, and mainly includes a control circuit, a first drive unit 50, and a second drive unit 32. The control circuit in the control unit 88 is configured as a microcomputer, for example, and includes an arithmetic device such as a CPU, a memory such as a ROM or a RAM, an AD converter, and the like. The control unit 88 is supplied with power from the first power supply unit 90 or the second power supply unit 92.
　制御部８８は、第１電圧検出部８０、第２電圧検出部８２、第１電流検出部８４、第２電流検出部８６に電気的に接続されており、各検出部の検出値を取得し得る。制御部８８は、取得した検出値に基づいてデューティ比を決定する機能、及び決定したデューティ比のＰＷＭ信号を生成し出力する機能を有している。制御部８８は、ＰＷＭ信号ＳＧ１を生成して、第１電圧変換部２１の各々に設けられた第１駆動部５０に出力することによって、複数の第１電圧変換部２１を個別に制御することができ、これにより第１電圧変換部２１（電圧変換装置２０）が昇圧又は降圧するように制御し得る。 The control unit 88 is electrically connected to the first voltage detection unit 80, the second voltage detection unit 82, the first current detection unit 84, and the second current detection unit 86, and acquires the detection value of each detection unit. obtain. The control unit 88 has a function of determining a duty ratio based on the acquired detection value and a function of generating and outputting a PWM signal having the determined duty ratio. The control unit 88 individually controls the plurality of first voltage conversion units 21 by generating the PWM signal SG1 and outputting the PWM signal SG1 to the first drive unit 50 provided in each of the first voltage conversion units 21. Thus, the first voltage converter 21 (voltage converter 20) can be controlled to step up or step down.
　電源装置１は、図２に示すように、複数の第１電圧変換部２１、複数の逆流防止用スイッチング素子２４、第２インダクタ２６、スイッチング素子２８、コンデンサ３０、第２駆動部３２、信号生成回路３４などを備える。 As shown in FIG. 2, the power supply device 1 includes a plurality of first voltage conversion units 21, a plurality of backflow prevention switching elements 24, a second inductor 26, a switching element 28, a capacitor 30, a second driving unit 32, and signal generation. A circuit 34 and the like are provided.
　複数（全て）の第１電圧変換部２１は、互いに並列に設けられている。第１電圧変換部２１は、各々、同期整流方式の昇降圧型ＤＣＤＣコンバータとして構成されており、第１導電路１０に印加された電圧を降圧して第２導電路１２に印加する第１の電圧変換動作を行い得る。また、第１電圧変換部２１は、各々、一端が第１導電路１０に電気的に接続されるとともに、他端が第２導電路１２に電気的に接続されている。 A plurality (all) of the first voltage converters 21 are provided in parallel with each other. Each of the first voltage converters 21 is configured as a synchronous rectification step-up / step-down DCDC converter. The first voltage converter 21 steps down the voltage applied to the first conductive path 10 and applies it to the second conductive path 12. A conversion operation may be performed. In addition, each of the first voltage converters 21 has one end electrically connected to the first conductive path 10 and the other end electrically connected to the second conductive path 12.
　第１電圧変換部２１は、各々、ハイサイド側のスイッチング素子４０と、ローサイド側のスイッチング素子４２と、第１インダクタ４４と、を備える。スイッチング素子４０は、Ｎチャネル型のＭＯＳＦＥＴとして構成されており、ドレインには第１導電路１０が電気的に接続されており、ソースにはスイッチング素子４２のドレインと、第１インダクタ４４の一端とが接続されている。スイッチング素子４０と第１インダクタ４４との接続点には、スイッチング素子４２のドレインが接続されている。スイッチング素子４２のソースは基準導電路に電気的に接続されている。なお、スイッチング素子４０が駆動用スイッチング素子の一例に相当する。 Each of the first voltage converters 21 includes a high-side switching element 40, a low-side switching element 42, and a first inductor 44. The switching element 40 is configured as an N-channel MOSFET, the first conductive path 10 is electrically connected to the drain, the drain of the switching element 42 and the one end of the first inductor 44 are connected to the source. Is connected. A drain of the switching element 42 is connected to a connection point between the switching element 40 and the first inductor 44. The source of the switching element 42 is electrically connected to the reference conductive path. The switching element 40 corresponds to an example of a driving switching element.
　第１電圧変換部２１は、各々、ハイサイド側のコンデンサ４６と、ローサイド側のコンデンサ４８と、を備える。コンデンサ４６の一端は第１導電路１０に接続されており、他端は基準導電路に電気的に接続されている。コンデンサ４８の一端は第２導電路１２に接続されており、第２導電路１２を介して、第１インダクタ４４の他端及び第２インダクタ２６の一端に接続されている。コンデンサ４８の他端は基準導電路に電気的に接続されている。 The first voltage converters 21 each include a high-side capacitor 46 and a low-side capacitor 48. One end of the capacitor 46 is connected to the first conductive path 10, and the other end is electrically connected to the reference conductive path. One end of the capacitor 48 is connected to the second conductive path 12, and is connected to the other end of the first inductor 44 and one end of the second inductor 26 via the second conductive path 12. The other end of the capacitor 48 is electrically connected to the reference conductive path.
　複数の第１電圧変換部２１にそれぞれ対応して複数の第１駆動部５０がそれぞれ設けられている。第１駆動部５０は、駆動部の一例に相当し、制御部８８で生成されたＰＷＭ信号ＳＧ１に基づき、スイッチング素子４０，４２のそれぞれを交互にオンするためのオン信号（ＰＷＭ信号）をスイッチング素子４０，４２のゲートに印加する。なお、第１駆動部５０がスイッチング素子４０，４２に出力するＰＷＭ信号が、制御信号の一例に相当する。以下では、第１駆動部５０がスイッチング素子４０，４２に出力するＰＷＭ信号を制御信号ともいう。 A plurality of first drive units 50 are provided respectively corresponding to the plurality of first voltage conversion units 21. The first drive unit 50 corresponds to an example of a drive unit, and switches on signals (PWM signals) for alternately turning on each of the switching elements 40 and 42 based on the PWM signal SG1 generated by the control unit 88. Applied to the gates of the elements 40 and 42. Note that the PWM signal output from the first drive unit 50 to the switching elements 40 and 42 corresponds to an example of a control signal. Hereinafter, the PWM signal output from the first driving unit 50 to the switching elements 40 and 42 is also referred to as a control signal.
　複数（全て）の逆流防止用スイッチング素子２４は、複数の半導体スイッチング素子２４Ａ，２４Ｂ，２４Ｃ・・・が並列に接続された構成をなし、全ての半導体スイッチング素子２４Ａ，２４Ｂ，２４Ｃ・・・のオフ動作時に第２導電路１２における第１電圧変換部２１側への電流の流れ込みを遮断する機能を有する。具体的には、複数の半導体スイッチング素子２４Ａ，２４Ｂ，２４Ｃ・・・のそれぞれがＮチャネル型のＭＯＳＦＥＴとして構成されており、それぞれのドレインが、第２導電路１２における第２電源部９２側の導電路に電気的に接続され、それぞれのソースが、第２導電路１２における第１電圧変換部２１側の導電路に電気的に接続されている。 The plurality (all) of the backflow prevention switching elements 24 have a configuration in which a plurality of semiconductor switching elements 24A, 24B, 24C... Are connected in parallel, and all of the semiconductor switching elements 24A, 24B, 24C. It has a function of interrupting the flow of current to the first voltage converter 21 side in the second conductive path 12 during the off operation. Specifically, each of the plurality of semiconductor switching elements 24A, 24B, 24C... Is configured as an N-channel type MOSFET, and each drain is on the second power supply section 92 side in the second conductive path 12. Each of the sources is electrically connected to the conductive path on the first voltage conversion unit 21 side in the second conductive path 12.
　第２インダクタ２６は、第２導電路１２における第１電圧変換部２１と逆流防止用スイッチング素子２４との間に設けられ、逆流防止用スイッチング素子２４に対して直列に設けられている。具体的には、第２インダクタ２６は、一端が各第１電圧変換部２１の第１インダクタ４４とコンデンサ４８との接続点に電気的に接続されており、他端が各逆流防止用スイッチング素子２４のソース及びスイッチング素子２８のドレインに電気的に接続されている。 The second inductor 26 is provided between the first voltage converter 21 and the backflow prevention switching element 24 in the second conductive path 12 and is provided in series with the backflow prevention switching element 24. Specifically, one end of the second inductor 26 is electrically connected to a connection point between the first inductor 44 and the capacitor 48 of each first voltage conversion unit 21, and the other end is a backflow prevention switching element. 24 sources and the drain of the switching element 28 are electrically connected.
　スイッチング素子２８は、半導体素子部の一例に相当し、例えばＭＯＳＦＥＴとして構成されている。スイッチング素子２８は、ドレイン（一端）が第２導電路１２における第２インダクタ２６と逆流防止用スイッチング素子２４との間に電気的に接続され、ソース（他端）が基準導電路に電気的に接続されている。 The switching element 28 corresponds to an example of a semiconductor element unit, and is configured as, for example, a MOSFET. The switching element 28 has a drain (one end) electrically connected between the second inductor 26 and the backflow prevention switching element 24 in the second conductive path 12 and a source (the other end) electrically connected to the reference conductive path. It is connected.
　コンデンサ３０は、一端が第２導電路１２における逆流防止用スイッチング素子２４よりも第２電源部９２側に接続されており、他端が基準導電路に電気的に接続されている。 The capacitor 30 has one end connected to the second power source 92 side of the backflow prevention switching element 24 in the second conductive path 12 and the other end electrically connected to the reference conductive path.
　本構成では、逆流防止用スイッチング素子２４、第２インダクタ２６、スイッチング素子２８（半導体素子部）、によって第２電圧変換部２２が構成される。この第２電圧変換部２２は、同期整流方式の昇降圧型ＤＣＤＣコンバータを構成し、第２導電路１２において自身よりも第１電圧変換部２１側を出力側導電路１２Ｂとし、第１電圧変換部２１側とは反対側を入力側導電路１２Ａとし、入力側導電路１２Ａに印加された電圧を降圧して出力側導電路１２Ｂに出力電圧を印加する第２の電圧変換動作を行い得る。 In this configuration, the second voltage conversion unit 22 is configured by the backflow prevention switching element 24, the second inductor 26, and the switching element 28 (semiconductor element unit). The second voltage converter 22 constitutes a synchronous rectification step-up / step-down DCDC converter. In the second conductive path 12, the first voltage converter 21 side of the second conductive path 12 is used as the output conductive path 12B, and the first voltage converter The side opposite to the 21 side is the input side conductive path 12A, and a second voltage conversion operation can be performed in which the voltage applied to the input side conductive path 12A is stepped down to apply the output voltage to the output side conductive path 12B.
　第２駆動部３２は、制御部８８で生成されたＰＷＭ信号ＳＧ２に基づき、逆流防止用スイッチング素子２４及びスイッチング素子２８のそれぞれを交互にオンするためのオン信号（ＰＷＭ信号）を逆流防止用スイッチング素子２４及びスイッチング素子２８のゲートに印加する。なお、第２駆動部３２が逆流防止用スイッチング素子２４に出力するＰＷＭ信号が、第２制御信号の一例に相当する。以下では、第２駆動部３２が逆流防止用スイッチング素子２４に出力するＰＷＭ信号を制御信号ともいう。 Based on the PWM signal SG <b> 2 generated by the control unit 88, the second drive unit 32 generates an on signal (PWM signal) for alternately turning on each of the backflow prevention switching element 24 and the switching element 28. Applied to the gates of the element 24 and the switching element 28. The PWM signal output from the second drive unit 32 to the backflow prevention switching element 24 corresponds to an example of a second control signal. Hereinafter, the PWM signal that the second drive unit 32 outputs to the backflow prevention switching element 24 is also referred to as a control signal.
　また、複数の逆流防止用スイッチング素子２４のうち、一部（本実施例１では１つ）の逆流防止用スイッチング素子２４Ａのゲートには、第２駆動部３２からの制御信号が直接与えられ、他の逆流防止用スイッチング素子２４Ｂには、第２駆動部３２からの制御信号が信号生成回路３４を介して与えられる。 In addition, a control signal from the second drive unit 32 is directly applied to the gates of some of the backflow prevention switching elements 24A among the plurality of backflow prevention switching elements 24 (one in the first embodiment), The control signal from the second drive unit 32 is supplied to the other backflow prevention switching element 24B via the signal generation circuit 34.
　信号生成回路３４は、第２駆動部３２と、逆流防止用スイッチング素子２４Ｂのゲートとの間に設けられている。信号生成回路３４は、制御部８８から出力された遮断指示信号ＳＧ３に基づき、第２駆動部３２から逆流防止用スイッチング素子２４Ｂに出力される制御信号を遮断する。 The signal generation circuit 34 is provided between the second drive unit 32 and the gate of the backflow prevention switching element 24B. The signal generation circuit 34 blocks the control signal output from the second drive unit 32 to the backflow prevention switching element 24B based on the blocking instruction signal SG3 output from the control unit 88.
　第２導電路１２と第１駆動部５０及び第２駆動部３２との間には、第３導電路６０が設けられている。第３導電路６０は、一部が並列となるように構成されており、並列に構成された一方の導電路にはダイオード６２が設けられ、他方の導電路にはダイオード６４及び電圧生成部６６が設けられている。ダイオード６２は、アノードが第２導電路１２に接続され、カソードが第１駆動部５０及び第２駆動部３２に接続されている。電圧生成部６６は、ダイオード６４に直列に接続されており、ダイオード６４の第２電源部９２側に設けられている。ダイオード６４は、アノードが電圧生成部６６に接続されており、カソードが第１駆動部５０及び第２駆動部３２に接続されている。電圧生成部６６は、例えば昇圧回路として構成されており、制御部８８からの昇圧指示信号ＳＧ４に基づき、第２導電路１２側から入力された電圧を昇圧して第１駆動部５０及び第２駆動部３２側に出力し得る。 A third conductive path 60 is provided between the second conductive path 12 and the first drive unit 50 and the second drive unit 32. The third conductive path 60 is configured so that a part thereof is in parallel. A diode 62 is provided in one conductive path configured in parallel, and a diode 64 and a voltage generation unit 66 are provided in the other conductive path. Is provided. The diode 62 has an anode connected to the second conductive path 12 and a cathode connected to the first drive unit 50 and the second drive unit 32. The voltage generation unit 66 is connected in series to the diode 64 and is provided on the second power supply unit 92 side of the diode 64. The diode 64 has an anode connected to the voltage generation unit 66 and a cathode connected to the first drive unit 50 and the second drive unit 32. The voltage generation unit 66 is configured as a booster circuit, for example, and boosts the voltage input from the second conductive path 12 side based on the boost instruction signal SG4 from the control unit 88 to boost the first drive unit 50 and the second drive unit 50. It can output to the drive part 32 side.
　次に電源装置１の動作について説明する。
　電源装置１は、第１負荷９４に第１電源部９０からの電力を供給すべくスイッチ部９８をオフ状態からオン状態に切り替える場合、第１負荷９４に存在する容量成分に急激に大電流が流れ込まないように、第２電源部９２の電力を用いて第１負荷９４の容量成分を事前に充電する動作（プリチャージ）を行い得る。 Next, the operation of the power supply device 1 will be described.
When the power supply device 1 switches the switch unit 98 from the off state to the on state in order to supply power from the first power supply unit 90 to the first load 94, a large current is suddenly applied to the capacitance component existing in the first load 94. In order not to flow in, the operation of precharging the capacitive component of the first load 94 using the power of the second power supply unit 92 (precharge) can be performed.
　制御部８８は、図３で示すプリチャージ制御を繰り返し実行するようになっており、図３のプリチャージ制御の開始に伴い、所定のプリチャージ条件が成立したか否かを判断する。プリチャージ条件は、例えば「スイッチ部９８（例えばイグニッションスイッチ）がオフ状態からオン状態に切り替わったこと」であってもよく、これ以外の所定条件であってもよい。 The control unit 88 is configured to repeatedly execute the precharge control shown in FIG. 3, and determines whether or not a predetermined precharge condition is satisfied with the start of the precharge control of FIG. The precharge condition may be, for example, “the switch unit 98 (eg, the ignition switch) has been switched from the off state to the on state”, or may be a predetermined condition other than this.
　制御部８８は、ステップＳ１においてプリチャージ条件が成立したと判定した場合、ステップＳ２にて、第２電圧変換部２２に第２の電圧変換動作を開始させる。第２の電圧変換動作は、第２電圧変換部２２が、外部から与えられる制御信号に応じて第２導電路１２の入力側導電路１２Ａに印加された電圧を降圧して出力側導電路１２Ｂに印加する動作である。具体的には、以下のようにして実現される。 When the control unit 88 determines that the precharge condition is satisfied in step S1, the control unit 88 causes the second voltage conversion unit 22 to start the second voltage conversion operation in step S2. In the second voltage conversion operation, the second voltage conversion unit 22 steps down the voltage applied to the input side conductive path 12A of the second conductive path 12 in accordance with a control signal given from the outside, and the output side conductive path 12B. It is the operation applied to. Specifically, it is realized as follows.
　制御部８８は、ステップＳ２で第２の電圧変換動作を開始した後、ステップＳ３にて切替条件が成立したか否かを判定する。具体的には、制御部８８は、ステップＳ３において、第１電圧検出部８０の検出値に基づき、第１導電路１０の電圧が所定閾値以上であるか否かを判定し、第１導電路１０の電圧が所定閾値未満であれば、ステップＳ３でＮｏに進み、第１導電路１０の電圧が所定閾値以上であれば、ステップＳ３でＹｅｓに進み、ステップＳ４において、第２の電圧変換動作から第３の電圧変換動作に切り替える。 The control unit 88 determines whether or not the switching condition is satisfied in step S3 after starting the second voltage conversion operation in step S2. Specifically, in step S3, the control unit 88 determines whether or not the voltage of the first conductive path 10 is equal to or higher than a predetermined threshold based on the detection value of the first voltage detection unit 80, and the first conductive path If the voltage of 10 is less than the predetermined threshold value, the process proceeds to No in step S3. If the voltage of the first conductive path 10 is equal to or higher than the predetermined threshold value, the process proceeds to Yes in step S3, and the second voltage conversion operation is performed in step S4. To the third voltage conversion operation.
　また、制御部８８は、第１電圧検出部８０又は第１電流検出部８４の検出値に基づき、デューティ比を決定し、決定したデューティ比のＰＷＭ信号ＳＧ２を生成する。そして、このＰＷＭ信号ＳＧ２を第２駆動部３２に出力する。このＰＷＭ信号ＳＧ２を入力した第２駆動部３２は、ＰＷＭ信号ＳＧ２のデューティ比の制御信号を逆流防止用スイッチング素子２４のうちの１つのスイッチング素子２４Ａに出力し、この制御信号に対して相補的なＰＷＭ信号をスイッチング素子２８に出力する。つまり、スイッチング素子２４Ａをオン動作させているときにスイッチング素子２８をオフ動作させ、スイッチング素子２４をオフ動作させているときにスイッチング素子２８をオン動作させる同期整流方式の降圧動作を、デッドタイムを設定しつつ実行する。第２駆動部３２からの制御信号は、信号生成回路３４にも入力される。信号生成回路３４は、信号ＳＧ３が遮断指示信号である場合に、スイッチング素子２４Ｂ，２４Ｃに対してオフ信号を出力し、このとき、スイッチング素子２４Ｂ，２４Ｃはオフ状態となる。また、信号生成回路３４は、信号ＳＧ３が許可信号である場合、第２駆動部３２からスイッチング素子２４Ａのゲートに出力される信号と同一の信号をスイッチング素子２４Ｂ，２４Ｃに出力する。制御部８８は、第２電圧変換部２２に第２の電圧変換動作を行わせている間（スイッチング素子２４Ａのゲートに制御信号を出力している間）は、信号生成回路３４に入力する信号ＳＧ３を遮断指示信号とするため、第２電圧変換部２２に第２の電圧変換動作を行わせている間は、スイッチング素子２４Ｂ，２４Ｃがオフ状態で維持される。つまり、第２電圧変換部２２に第２の電圧変換動作を行わせている間は、第２駆動部３２が出力した制御信号は、スイッチング素子２４Ａのみに出力され、スイッチング素子２４Ｂ，２４Ｃはオフ状態で維持されるため、スイッチング素子２４Ａのみがオンオフ動作する。 Further, the control unit 88 determines the duty ratio based on the detection value of the first voltage detection unit 80 or the first current detection unit 84, and generates the PWM signal SG2 having the determined duty ratio. The PWM signal SG <b> 2 is output to the second drive unit 32. The second drive unit 32 receiving the PWM signal SG2 outputs a control signal having a duty ratio of the PWM signal SG2 to one switching element 24A of the backflow prevention switching elements 24, and is complementary to the control signal. The PWM signal is output to the switching element 28. In other words, the synchronous rectification step-down operation in which the switching element 28 is turned off when the switching element 24A is turned on and the switching element 28 is turned on when the switching element 24 is turned off is reduced in dead time. Execute while setting. The control signal from the second drive unit 32 is also input to the signal generation circuit 34. When the signal SG3 is a cutoff instruction signal, the signal generation circuit 34 outputs an off signal to the switching elements 24B and 24C. At this time, the switching elements 24B and 24C are turned off. Further, when the signal SG3 is a permission signal, the signal generation circuit 34 outputs the same signal as the signal output from the second drive unit 32 to the gate of the switching element 24A to the switching elements 24B and 24C. The control unit 88 is a signal that is input to the signal generation circuit 34 while the second voltage conversion unit 22 performs the second voltage conversion operation (while the control signal is output to the gate of the switching element 24A). In order to use SG3 as a cutoff instruction signal, the switching elements 24B and 24C are maintained in the OFF state while the second voltage conversion unit 22 is performing the second voltage conversion operation. That is, while the second voltage conversion unit 22 is performing the second voltage conversion operation, the control signal output by the second drive unit 32 is output only to the switching element 24A, and the switching elements 24B and 24C are turned off. Since the state is maintained, only the switching element 24A is turned on / off.
　このように、第２駆動部３２からスイッチング素子２４Ａに対してＰＷＭ信号（制御信号）が与えられることにより、第２電圧変換部２２は、入力側導電路１２Ａに印加された電圧を降圧して出力側導電路１２Ｂに印加するように第２の電圧変換動作を行う。この第２の電圧変換動作では、第１導電路１０に印加される電圧を第２電源部９２の満充電時の出力電圧よりも低い所望の目標電圧に近づけるようにデューティを算出するフィードバック演算が繰り返され、第１導電路１０に印加される電圧を所望の目標電圧に近づけるように制御がなされる。このように第２の電圧変換動作が行われている間は、第１負荷９４の容量成分に充電がなされる。 Thus, when the PWM signal (control signal) is given from the second drive unit 32 to the switching element 24A, the second voltage conversion unit 22 steps down the voltage applied to the input side conductive path 12A. A second voltage conversion operation is performed so as to be applied to the output side conductive path 12B. In the second voltage conversion operation, a feedback calculation is performed to calculate the duty so that the voltage applied to the first conductive path 10 approaches a desired target voltage lower than the output voltage when the second power supply unit 92 is fully charged. The control is repeated so that the voltage applied to the first conductive path 10 approaches the desired target voltage. As described above, while the second voltage conversion operation is performed, the capacitance component of the first load 94 is charged.
　制御部８８は、ステップＳ３において所定の切替条件が成立したと判定した場合、即ち、第１導電路１０の電圧が所定閾値以上であると判定した場合、ステップＳ４において、第２電圧変換部２２による第２の電圧変換動作を終了させ、第１電圧変換部２１による第３の電圧変換動作を開始させる。第３の電圧変換動作は、第１駆動部５０からスイッチング素子４０，４２に対してＰＷＭ信号ＳＧ１に基づくオン信号を交互に与えることによって電圧変換装置２０において同期整流方式の昇圧動作を行い、第２導電路１２に印加された電圧を昇圧して第１導電路１０に印加する動作である。 When it is determined that the predetermined switching condition is satisfied in step S3, that is, when it is determined that the voltage of the first conductive path 10 is equal to or higher than the predetermined threshold, the control unit 88 in step S4, the second voltage conversion unit 22 is determined. The second voltage conversion operation by is terminated, and the third voltage conversion operation by the first voltage conversion unit 21 is started. The third voltage conversion operation performs a synchronous rectification boosting operation in the voltage conversion device 20 by alternately applying an ON signal based on the PWM signal SG1 to the switching elements 40 and 42 from the first drive unit 50, In this operation, the voltage applied to the second conductive path 12 is boosted and applied to the first conductive path 10.
　制御部８８は、この第３の電圧変換動作中には、信号生成回路３４に対する遮断指示信号ＳＧ３の出力を停止し、第２駆動部３２にオン信号を出力する。このオン信号を入力した第２駆動部３２は、逆流防止用スイッチング素子２４を構成する全てのスイッチング素子２４Ａ，２４Ｂ，２４Ｃ・・・にオン信号を出力するとともに、スイッチング素子２８にオフ信号を出力する。従って、第３の電圧変換動作中は、逆流防止用スイッチング素子２４を構成する全てのスイッチング素子２４Ａ，２４Ｂ，２４Ｃ・・・がオン状態で維持され、スイッチング素子２８がオフ状態で維持される。 During the third voltage conversion operation, the control unit 88 stops outputting the cutoff instruction signal SG3 to the signal generation circuit 34 and outputs an ON signal to the second drive unit 32. The second drive unit 32 receiving this ON signal outputs an ON signal to all the switching elements 24A, 24B, 24C,... Constituting the backflow prevention switching element 24 and outputs an OFF signal to the switching element 28. To do. Therefore, during the third voltage conversion operation, all the switching elements 24A, 24B, 24C... Constituting the backflow prevention switching element 24 are maintained in the on state, and the switching element 28 is maintained in the off state.
　制御部８８は、第１電圧検出部８０又は第１電流検出部８４の検出値に基づき、デューティ比を決定し、決定したデューティ比のＰＷＭ信号ＳＧ１を生成する。具体的には、第１導電路１０に印加される電圧を第２電源部９２の満充電時の出力電圧よりも高い所望の目標電圧に近づけるようにデューティを算出するフィードバック演算を繰り返し、第１導電路１０に印加される電圧を所望の目標電圧に近づけるように制御を行う。制御部８８は、このように生成したＰＷＭ信号ＳＧ１を、複数の第１電圧変換部２１のうち１つの第１電圧変換部２１に対応する第１駆動部５０にのみ出力する。このＰＷＭ信号ＳＧ１を入力した第１駆動部５０は、ＰＷＭ信号ＳＧ１のデューティ比の制御信号をスイッチング素子４２に出力するとともに、この制御信号（ＰＷＭ信号ＳＧ１）に対して相補的な制御信号をスイッチング素子４０に出力する。つまり、スイッチング素子４２をオン動作させているときにスイッチング素子４０をオフ動作させ、スイッチング素子４２をオフ動作させているときにスイッチング素子４０をオン動作させる同期整流方式の制御を、デッドタイムを設定した形で実行する。なお、制御部８８は、複数の第１電圧変換部２１のうち他の第１電圧変換部２１の第１駆動部５０にはオフ信号を出力する。このオフ信号が入力される第１駆動部５０は、対応するスイッチング素子４０，４２をオフ状態で維持する。 The control unit 88 determines the duty ratio based on the detection value of the first voltage detection unit 80 or the first current detection unit 84, and generates the PWM signal SG1 having the determined duty ratio. Specifically, the feedback calculation for calculating the duty is repeated so that the voltage applied to the first conductive path 10 approaches a desired target voltage that is higher than the output voltage when the second power supply unit 92 is fully charged, Control is performed so that the voltage applied to the conductive path 10 approaches a desired target voltage. The control unit 88 outputs the PWM signal SG <b> 1 generated in this way only to the first drive unit 50 corresponding to one first voltage conversion unit 21 among the plurality of first voltage conversion units 21. The first drive unit 50 having received the PWM signal SG1 outputs a control signal having a duty ratio of the PWM signal SG1 to the switching element 42 and switches a control signal complementary to the control signal (PWM signal SG1). Output to the element 40. That is, when the switching element 42 is turned on, the switching element 40 is turned off, and when the switching element 42 is turned off, the synchronous rectification control that turns on the switching element 40 sets the dead time. Execute in the form. The control unit 88 outputs an off signal to the first drive unit 50 of the other first voltage conversion unit 21 among the plurality of first voltage conversion units 21. The first driving unit 50 to which the off signal is input maintains the corresponding switching elements 40 and 42 in the off state.
　このようにして、第２導電路１２に印加された電圧を昇圧して第１導電路１０に印加する第３の電圧変換動作が行われる。この第３の電圧変換動作では、第２の電圧変換動作で電荷が蓄積された第１負荷９４の容量成分に対して、更に電荷を蓄積させることができ、容量成分の充電電圧をより高めることができる。 In this way, a third voltage conversion operation is performed in which the voltage applied to the second conductive path 12 is boosted and applied to the first conductive path 10. In the third voltage conversion operation, charges can be further accumulated with respect to the capacitance component of the first load 94 in which charges are accumulated in the second voltage conversion operation, and the charge voltage of the capacitance component is further increased. Can do.
　制御部８８は、ステップＳ４にて第３の電圧変換動作を開始した後、ステップＳ５にて、所定のプリチャージ終了条件が成立したか否かを判定する。所定のプリチャージ終了条件は、例えば、「第１導電路１０の電圧が所定電圧を超えたこと」などである。 After starting the third voltage conversion operation in step S4, the control unit 88 determines whether or not a predetermined precharge end condition is satisfied in step S5. The predetermined precharge end condition is, for example, “the voltage of the first conductive path 10 exceeds a predetermined voltage”.
　制御部８８は、ステップＳ５においてプリチャージ終了条件が成立していないと判定した場合、プリチャージ終了条件が成立するまでステップＳ５を繰り返す。この間、第１負荷９４の容量成分の充電が進行する。制御部８８は、ステップＳ５においてプリチャージ終了条件が成立したと判定した場合、ステップＳ６にて第３の電圧変換動作を終了する。即ち、ＰＷＭ信号ＳＧ１、ＰＷＭ信号ＳＧ２、遮断指示信号ＳＧ３、及び昇圧指示信号ＳＧ４の出力を停止する。これにより第１負荷９４へのプリチャージが完了する。 When it is determined in step S5 that the precharge end condition is not satisfied, the control unit 88 repeats step S5 until the precharge end condition is satisfied. During this time, charging of the capacitive component of the first load 94 proceeds. When it is determined in step S5 that the precharge end condition is satisfied, the control unit 88 ends the third voltage conversion operation in step S6. That is, the output of the PWM signal SG1, the PWM signal SG2, the cutoff instruction signal SG3, and the boost instruction signal SG4 is stopped. Thereby, the precharge to the first load 94 is completed.
　制御部８８は、ステップＳ６にて第３の電圧変換動作を終了させた後、例えば、スイッチ部９８をオフ状態からオン状態に切り替える。こうすることで、第１負荷９４の容量成分をある程度充電した状態で、スイッチ部９８をオン状態に切り替えることができるため、第１負荷９４の容量成分に大電流が流れ込むような事態が生じにくくなる。なお、ステップＳ６に応じてスイッチ部９８をオン状態に切り替えた後には、電圧変換装置２０に上述の降圧動作を行わせ、第１導電路１０に印加された電圧を降圧して第２導電路に所望の出力電圧を印加するように機能すればよい。 The control unit 88, for example, switches the switch unit 98 from the off state to the on state after finishing the third voltage conversion operation in step S6. By doing so, since the switch unit 98 can be switched to the on state while the capacity component of the first load 94 is charged to some extent, a situation in which a large current flows into the capacity component of the first load 94 is unlikely to occur. Become. In addition, after switching the switch part 98 to an ON state according to step S6, the voltage converter 20 performs the above-described step-down operation, and steps down the voltage applied to the first conductive path 10 to reduce the second conductive path. It is sufficient to function so as to apply a desired output voltage.
　なお、本構成では、制御部８８は、第１の電圧変換動作中、又は第２の電圧変換動作中、又は第３の電圧変換動作中に、電圧生成部６６に対して昇圧指示信号ＳＧ４を出力し、電圧生成部６６は、この昇圧指示信号ＳＧ４が与えられている期間に、入力電圧（第２導電路１２に印加された電圧）を昇圧させてダイオード６４のアノード側に出力する。なお、制御部８８は、第１の電圧変換動作中、第２の電圧変換動作中、第３の電圧変換動作中のいずれか又は全ての期間に昇圧指示信号ＳＧ４を出力してもよく、第２導電路１２に印加された電圧が所定値以下の場合にのみ昇圧指示信号ＳＧ４を出力してもよい。 In this configuration, the control unit 88 outputs the boost instruction signal SG4 to the voltage generation unit 66 during the first voltage conversion operation, the second voltage conversion operation, or the third voltage conversion operation. The voltage generation unit 66 boosts the input voltage (voltage applied to the second conductive path 12) and outputs it to the anode side of the diode 64 during the period when the boost instruction signal SG4 is given. The control unit 88 may output the boost instruction signal SG4 during any or all of the periods during the first voltage conversion operation, the second voltage conversion operation, and the third voltage conversion operation. The boost instruction signal SG4 may be output only when the voltage applied to the two conductive paths 12 is equal to or lower than a predetermined value.
　次に電源装置１の効果について例示する。
　上述した電源装置１は、逆流防止用スイッチング素子２４と第２インダクタ２６とスイッチング素子２８（半導体素子部）とを備えた形で第２電圧変換部２２が構成され、この第２電圧変換部２２は、第２導電路１２において、自身よりも第１電圧変換部２１側を出力側導電路１２Ｂとし、第１電圧変換部２１側とは反対側を入力側導電路１２Ａとし、入力側導電路１２Ａに印加された電圧を降圧して出力側導電路１２Ｂに出力電圧を印加する第２の電圧変換動作を行う。更に、逆流防止用スイッチング素子２４は、複数の半導体スイッチング素子２４Ａ，２４Ｂ，２４Ｃ・・・が並列に接続された構成をなしており、制御部８８は、所定のプリチャージ条件の成立に応じて、逆流防止用スイッチング素子２４を構成する複数の半導体スイッチング素子２４Ａ，２４Ｂ，２４Ｃ・・・のうちの一部の素子にのみオン信号とオフ信号とが交互に切り替わる第２制御信号を与えることで、第２電圧変換部２２に第２の電圧変換動作を行わせる。 Next, the effect of the power supply device 1 is illustrated.
In the power supply device 1 described above, the second voltage conversion unit 22 is configured to include the backflow prevention switching element 24, the second inductor 26, and the switching element 28 (semiconductor element unit). In the second conductive path 12, the first voltage conversion unit 21 side from itself is the output side conductive path 12B, the opposite side of the first voltage conversion unit 21 side is the input side conductive path 12A, and the input side conductive path A second voltage conversion operation is performed in which the voltage applied to 12A is stepped down to apply the output voltage to the output-side conductive path 12B. Further, the backflow prevention switching element 24 has a configuration in which a plurality of semiconductor switching elements 24A, 24B, 24C,... Are connected in parallel, and the control unit 88 responds when a predetermined precharge condition is established. The second control signal in which the ON signal and the OFF signal are alternately switched is given to only some of the plurality of semiconductor switching elements 24A, 24B, 24C... Constituting the backflow prevention switching element 24. Then, the second voltage conversion unit 22 is caused to perform the second voltage conversion operation.
　このように、電源装置１は、所定のプリチャージ条件の成立に応じて第２電圧変換部２２に第２の電圧変換動作を行わせることができるため、少なくともこのように第２の電圧変換動作が行われた後にスイッチ部９８がオフ状態からオン状態に切り替えられる状況であれば、容量成分の充電がある程度進行した状況でスイッチ部９８がオフ状態からオン状態に切り替えられることになるため、その切り替え直後に第１電源部９０から容量成分に流れ込む突入電流を抑えることができる。 As described above, the power supply device 1 can cause the second voltage conversion unit 22 to perform the second voltage conversion operation in accordance with the establishment of the predetermined precharge condition. Therefore, at least the second voltage conversion operation is performed as described above. If the switch unit 98 is switched from the off state to the on state after the switch is performed, the switch unit 98 is switched from the off state to the on state in a state where the charging of the capacitance component has progressed to some extent. The inrush current flowing into the capacitive component from the first power supply unit 90 immediately after switching can be suppressed.
　しかも、所定のプリチャージ条件の成立に応じて制御部８８が第２電圧変換部２２に第２の電圧変換動作を行わせる場合に、逆流防止用スイッチング素子２４を構成する複数の半導体スイッチング素子２４Ａ，２４Ｂ，２４Ｃ・・・のうちの一部の素子にのみ第２制御信号を与える構成であるため、「第２の電圧変換動作に伴って逆流防止用スイッチング素子２４を駆動するために制御部８８で必要となる電力」を抑えることができる。ゆえに、制御部８８に電力を与える電源の電圧が低下しても、制御部８８がプリチャージ動作の制御（第２の電圧変換動作の制御）を行えない事態は発生しにくくなる。 In addition, when the control unit 88 causes the second voltage conversion unit 22 to perform the second voltage conversion operation in response to the establishment of a predetermined precharge condition, a plurality of semiconductor switching elements 24A constituting the backflow prevention switching element 24 are provided. , 24B, 24C,..., 24B, 24C,..., “A control unit for driving the backflow prevention switching element 24 in association with the second voltage conversion operation. It is possible to suppress the “power required by 88”. Therefore, even when the voltage of the power supply that supplies power to the control unit 88 is reduced, it is difficult for the control unit 88 to perform the precharge operation control (control of the second voltage conversion operation).
　更に、電源装置１は、第２導電路１２から制御部８８への電力供給経路となる複数の第３導電路６０を備える。そして、複数の第３導電路６０は、第２導電路１２と制御部８８との間に並列に接続され、いずれかの第３導電路６０には、第２導電路１２側の導電路に印加された電圧を昇圧して制御部８８側の導電路に出力電圧を印加する電圧生成部６６が設けられている。この構成によれば、第２導電路１２に印加された電圧が小さい場合であっても、電圧生成部６６は、第２導電路１２側の導電路に印加された電圧を昇圧して制御部８８側の導電路に出力電圧を印加することができる。よって、第２導電路１２に印加された電圧が小さい場合であっても、制御部８８の動作に必要な駆動電圧が確保されやすくなる。 Furthermore, the power supply device 1 includes a plurality of third conductive paths 60 serving as power supply paths from the second conductive paths 12 to the control unit 88. The plurality of third conductive paths 60 are connected in parallel between the second conductive path 12 and the control unit 88, and any of the third conductive paths 60 is connected to a conductive path on the second conductive path 12 side. A voltage generation unit 66 is provided that boosts the applied voltage and applies an output voltage to the conductive path on the control unit 88 side. According to this configuration, even when the voltage applied to the second conductive path 12 is small, the voltage generating unit 66 boosts the voltage applied to the conductive path on the second conductive path 12 side to increase the control unit. An output voltage can be applied to the conductive path on the 88 side. Therefore, even when the voltage applied to the second conductive path 12 is small, a drive voltage necessary for the operation of the control unit 88 is easily secured.
　更に、制御部８８は、所定のプリチャージ条件の成立に応じて、逆流防止用スイッチング素子２４を構成する複数の半導体スイッチング素子２４Ａ，２４Ｂ，２４Ｃ・・・のうちの１つの半導体スイッチング素子にのみ第２制御信号を与え、第２電圧変換部２２に第２の電圧変換動作を行わせる。この構成によれば、第２の電圧変換動作を行う際に半導体スイッチング素子の駆動数を最小限に抑えることができるため、第２の電圧変換動作の際に消費する電力をより一層小さく抑えることができる。 Furthermore, the control unit 88 applies only to one semiconductor switching element among the plurality of semiconductor switching elements 24A, 24B, 24C,... Constituting the backflow prevention switching element 24 in response to establishment of a predetermined precharge condition. A second control signal is given to cause the second voltage converter 22 to perform a second voltage conversion operation. According to this configuration, since the number of driving semiconductor switching elements can be minimized when performing the second voltage conversion operation, the power consumed during the second voltage conversion operation can be further reduced. Can do.
　さらに、電源装置１では、半導体素子部をスイッチング素子２８としている。このため、例えば、スイッチング素子２８をオン状態にすることによって、第２インダクタ２６や第１インダクタ４４の臨界電流より小さな電流が流れた場合に第２インダクタ２６や第１インダクタ４４に生じる逆向きの電流（以降、逆向き電流ともいう）をスイッチング素子２８に蓄電することなく基準導電路に流すことができる。これにより、第２の電圧変換動作を行う場合、逆流防止用スイッチング素子２４からの出力に逆向き電流が加わることが防止されるため、逆流防止用スイッチング素子２４の出力の幅（デューティ）が逆向き電流によって意図せずに変化してしまうことを抑えることができる。 Furthermore, in the power supply device 1, the semiconductor element portion is the switching element 28. Therefore, for example, when the switching element 28 is turned on, when a current smaller than the critical current of the second inductor 26 or the first inductor 44 flows, the reverse direction generated in the second inductor 26 or the first inductor 44 is generated. A current (hereinafter also referred to as a reverse current) can be passed through the reference conductive path without being stored in the switching element 28. Accordingly, when the second voltage conversion operation is performed, the reverse current is prevented from being applied to the output from the backflow prevention switching element 24, and therefore the output width (duty) of the backflow prevention switching element 24 is reversed. Unintentional change due to the direction current can be suppressed.
　更に、制御部８８は、第２電圧変換部２２に第２の電圧変換動作を行わせる期間に、駆動用スイッチング素子４０をオン状態にする。このようにすれば、第２の電圧変換動作の際に駆動用スイッチング素子４０で生じる電圧降下をより小さく抑えることができる。 Furthermore, the control unit 88 turns on the driving switching element 40 during a period in which the second voltage conversion unit 22 performs the second voltage conversion operation. In this way, the voltage drop that occurs in the drive switching element 40 during the second voltage conversion operation can be further reduced.
　例えば、図２のように、スイッチング素子４０としてＦＥＴを用い、第２の電圧変換動作の際にスイッチング素子４０（ＦＥＴ）をオフ状態にするとともにＦＥＴのボディダイオードのみを通電経路として第２導電路１２側から第１導電路１０側へと電流を流すようにすると、このボディダイオードでの損失が懸念されるが、第２電圧変換部２２に第２の電圧変換動作を行わせる期間に駆動用スイッチング素子４０をオン状態にすれば、この損失を確実に低減することができる。なお、第２の電圧変換動作中は、スイッチング素子４２についてはオフ状態で維持すればよい。 For example, as shown in FIG. 2, an FET is used as the switching element 40, and the second conductive path is set with the switching element 40 (FET) turned off during the second voltage conversion operation and only the FET body diode is used as a current-carrying path. If a current is allowed to flow from the 12 side to the first conductive path 10 side, there is a concern about the loss in the body diode, but it is for driving during a period in which the second voltage conversion unit 22 performs the second voltage conversion operation. If the switching element 40 is turned on, this loss can be reliably reduced. Note that the switching element 42 may be maintained in the off state during the second voltage conversion operation.
　＜他の実施例＞
　本発明は上記記述及び図面によって説明した実施例に限定されるものではなく、例えば次のような実施例も本発明の技術的範囲に含まれる。 <Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
　実施例１では、第２の電圧変換動作において複数の逆流防止用スイッチング素子２４のうち１つにのみ制御信号を出力するようにしたが、一部であれば２つ以上の逆流防止用スイッチング素子２４に制御信号を出力するようにしてもよい。 In the first embodiment, the control signal is output to only one of the plurality of backflow prevention switching elements 24 in the second voltage conversion operation, but two or more backflow prevention switching elements may be used in some cases. The control signal may be output to 24.
　実施例１では、第１電源部９０（第１負荷９４）側を高電圧側とし第２電源部９２（第２負荷９６）側を低電圧側としたが、第１電源部９０（第１負荷９４）側を低電圧側とし第２電源部９２（第２負荷９６）側を高電圧側としてもよい。即ち、低電圧側の容量成分にプリチャージする構成に適用することもできる。 In the first embodiment, the first power supply unit 90 (first load 94) side is set to the high voltage side, and the second power supply unit 92 (second load 96) side is set to the low voltage side. The load 94) side may be the low voltage side, and the second power supply unit 92 (second load 96) side may be the high voltage side. That is, the present invention can be applied to a configuration in which a low voltage side capacitance component is precharged.
　実施例１では、第３導電路６０において、電圧生成部６６を設けるようにしたが、電圧生成部６６を設けなくてもよい。 In the first embodiment, the voltage generation unit 66 is provided in the third conductive path 60, but the voltage generation unit 66 may not be provided.
　実施例１では、第３の電圧変換動作において複数の第１電圧変換部２１のうち１つの第１電圧変換部２１のスイッチング素子４０にのみ制御信号を出力するようにしたが、一部の第１電圧変換部２１のスイッチング素子４０であれば、２つ以上の第１電圧変換部２１のスイッチング素子４０に制御信号を出力するようにしてもよい。 In the first embodiment, in the third voltage conversion operation, the control signal is output only to the switching element 40 of one first voltage conversion unit 21 among the plurality of first voltage conversion units 21. If it is the switching element 40 of the 1 voltage conversion part 21, you may make it output a control signal to the switching element 40 of two or more 1st voltage conversion parts 21. FIG.
　実施例１では、半導体素子部をスイッチング素子としたが、ダイオードとしてもよい。ダイオードとする場合、アノードを基準導電路に電気的に接続し、カソードを第２導電路１２における第２インダクタ２６と逆流防止用スイッチング素子２４との間に電気的に接続し、第２電圧変換部２２をダイオード方式のＤＣＤＣコンバータとして機能させればよい。 In Example 1, the semiconductor element portion is a switching element, but may be a diode. In the case of the diode, the anode is electrically connected to the reference conductive path, the cathode is electrically connected between the second inductor 26 and the backflow prevention switching element 24 in the second conductive path 12, and the second voltage conversion is performed. The unit 22 may function as a diode-type DCDC converter.
１…車載用の電源装置
１０…第１導電路
１２…第２導電路
１２Ａ…入力側導電路
１２Ｂ…出力側導電路
２１…第１電圧変換部
２２…第２電圧変換部
２４…逆流防止用スイッチング素子
２４Ａ，２４Ｂ，２４Ｃ…半導体スイッチング素子
２６…第２インダクタ
２８…スイッチング素子（半導体素子部）
４０…スイッチング素子（駆動用スイッチング素子）
４２…スイッチング素子（駆動用スイッチング素子）
４４…第１インダクタ
６０…第３導電路
６６…電圧生成部
８８…制御部
９０…第１電源部
９２…第２電源部
９４…第１負荷
９６…第２負荷
９８…スイッチ部
１００…車載用電源システム DESCRIPTION OF SYMBOLS 1 ... Vehicle-mounted power supply device 10 ... 1st conductive path 12 ... 2nd conductive path 12A ... Input side conductive path 12B ... Output side conductive path 21 ... 1st voltage converter 22 ... 2nd voltage converter 24 ... For backflow prevention Switching elements 24A, 24B, 24C ... Semiconductor switching element 26 ... Second inductor 28 ... Switching element (semiconductor element part)
40. Switching element (switching element for driving)
42. Switching element (switching element for driving)
44 ... 1st inductor 60 ... 3rd conductive path 66 ... Voltage generation part 88 ... Control part 90 ... 1st power supply part 92 ... 2nd power supply part 94 ... 1st load 96 ... 2nd load 98 ... Switch part 100 ... In-vehicle use Power system

Claims (5)

  1. 　第１電源部からの電力が第１導電路を介して供給される構成をなし、第２電源部からの電力が第２導電路を介して供給される構成をなし、容量成分が前記第１導電路に電気的に接続され、前記第１電源部と前記容量成分との間に前記第１電源部から前記容量成分側への通電を許容するオン状態と遮断するオフ状態とに切り替わるスイッチ部が設けられた車載用の電源システムにおいて、前記第１導電路に印加された電圧を降圧して前記第２導電路に印加、または前記第２導電路に印加された電圧を昇圧して前記第１導電路に印加する車載用の電源装置であって、
    　オン信号とオフ信号とが交互に切り替えられる第１制御信号が与えられることに応じてオンオフ動作する駆動用スイッチング素子及び第１インダクタを備え、前記駆動用スイッチング素子のオンオフ動作により前記第１導電路に印加された電圧を降圧して前記第２導電路に印加する第１の電圧変換動作を行う第１電圧変換部と、
    　前記第２導電路に設けられ、オフ動作時に前記第２導電路における前記第１電圧変換部側への電流の流れ込みを遮断する逆流防止用スイッチング素子と、
    　前記第２導電路における前記第１電圧変換部と前記逆流防止用スイッチング素子との間に設けられ、前記逆流防止用スイッチング素子に対して直列に設けられる第２インダクタと、
    　一端が前記第２導電路における前記第２インダクタと前記逆流防止用スイッチング素子との間に電気的に接続され、他端が基準導電路に電気的に接続されるダイオード又はスイッチング素子からなる半導体素子部と、
    　少なくとも前記駆動用スイッチング素子に対して前記第１制御信号を出力する制御部と、
    　を備え、
    　前記逆流防止用スイッチング素子と前記第２インダクタと前記半導体素子部とを備え、前記第２導電路において、自身よりも前記第１電圧変換部側を出力側導電路とし、前記第１電圧変換部側とは反対側を入力側導電路とし、前記入力側導電路に印加された電圧を降圧して前記出力側導電路に出力電圧を印加する第２の電圧変換動作を行う第２電圧変換部が構成され、
    　前記逆流防止用スイッチング素子は、複数の半導体スイッチング素子が並列に接続された構成をなし、
    　前記制御部は、所定のプリチャージ条件の成立に応じて、前記逆流防止用スイッチング素子を構成する複数の前記半導体スイッチング素子のうちの一部の素子にのみオン信号とオフ信号とが交互に切り替わる第２制御信号を与えることで、前記第２電圧変換部に第２の電圧変換動作を行わせる車載用の電源装置。     The power supply from the first power supply unit is configured to be supplied through the first conductive path, the power from the second power supply unit is configured to be supplied through the second conductive path, and the capacitance component is the first. A switch unit that is electrically connected to a conductive path and switches between an on state that allows energization from the first power source unit to the capacitive component side and an off state that blocks the current between the first power source unit and the capacitive component. In the in-vehicle power supply system, the voltage applied to the first conductive path is stepped down and applied to the second conductive path, or the voltage applied to the second conductive path is boosted and the first An in-vehicle power supply device that applies to one conductive path,
    The first conductive path includes a drive switching element and a first inductor that perform an on / off operation in response to a first control signal that is alternately switched between an on signal and an off signal, and the on / off operation of the drive switching element. A first voltage conversion unit that performs a first voltage conversion operation of stepping down a voltage applied to the second conductive path and applying it to the second conductive path;
    A backflow preventing switching element that is provided in the second conductive path and blocks the flow of current to the first voltage conversion unit in the second conductive path during an off operation;
    A second inductor provided between the first voltage conversion unit and the backflow prevention switching element in the second conductive path, and provided in series with the backflow prevention switching element;
    A semiconductor element comprising a diode or a switching element having one end electrically connected between the second inductor and the backflow preventing switching element in the second conductive path and the other end electrically connected to a reference conductive path And
    A control unit for outputting the first control signal to at least the driving switching element;
    With
    The switching element for preventing backflow, the second inductor, and the semiconductor element unit, and in the second conductive path, the first voltage conversion unit side of the second conductive path is an output side conductive path, and the first voltage conversion unit A second voltage conversion unit that performs a second voltage conversion operation in which a side opposite to the input side is an input side conductive path, and a voltage applied to the input side conductive path is stepped down to apply an output voltage to the output side conductive path Is configured,
    The backflow prevention switching element has a configuration in which a plurality of semiconductor switching elements are connected in parallel,
    The control unit alternately switches an on signal and an off signal to only a part of the plurality of semiconductor switching elements constituting the backflow prevention switching element according to establishment of a predetermined precharge condition. An in-vehicle power supply device that causes the second voltage conversion unit to perform a second voltage conversion operation by giving a second control signal.
  2. 　前記第２導電路から前記制御部への電力供給経路となる複数の第３導電路を備え、
    　複数の前記第３導電路は、前記第２導電路と前記制御部との間に並列に接続され、いずれかの前記第３導電路には、前記第２導電路側の導電路に印加された電圧を昇圧して前記制御部側の導電路に出力電圧を印加する電圧生成部が設けられている請求項１に記載の車載用の電源装置。     A plurality of third conductive paths serving as power supply paths from the second conductive paths to the control unit;
    The plurality of third conductive paths are connected in parallel between the second conductive path and the control unit, and one of the third conductive paths is applied to a conductive path on the second conductive path side. The in-vehicle power supply device according to claim 1, further comprising a voltage generation unit that boosts a voltage and applies an output voltage to the conductive path on the control unit side.
  3. 　前記制御部は、前記所定のプリチャージ条件の成立に応じて、前記逆流防止用スイッチング素子を構成する複数の前記半導体スイッチング素子のうちの１つの前記半導体スイッチング素子にのみ前記第２制御信号を与え、前記第２電圧変換部に第２の電圧変換動作を行わせる請求項１又は２に記載の車載用の電源装置。 The control unit gives the second control signal only to one of the semiconductor switching elements of the plurality of semiconductor switching elements constituting the backflow prevention switching element in response to establishment of the predetermined precharge condition. The in-vehicle power supply device according to claim 1, wherein the second voltage conversion unit performs a second voltage conversion operation.
  4. 　前記半導体素子部は、スイッチング素子である請求項１乃至３のいずれか１項に記載の車載用の電源装置。 The in-vehicle power supply device according to any one of claims 1 to 3, wherein the semiconductor element portion is a switching element.
  5. 　前記制御部は、前記第２電圧変換部に前記第２の電圧変換動作を行わせる期間に、前記駆動用スイッチング素子をオン状態にする請求項１乃至４のいずれか１項に記載の車載用の電源装置。 5. The vehicle-mounted device according to claim 1, wherein the control unit turns on the driving switching element during a period in which the second voltage conversion unit performs the second voltage conversion operation. 6. Power supply.
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